【正文】 re doing，故選C。21．C【詳解】句意：吉姆，別出聲！你的小妹妹現(xiàn)在正在睡覺(jué)。根據(jù)“What are you up to”可知，答語(yǔ)要用現(xiàn)在進(jìn)行時(shí)，表示現(xiàn)在正在進(jìn)行的動(dòng)作，結(jié)構(gòu)為a解析：C【詳解】句意：——嗨，大明。故選B。故選B。故選C。我在商店里買一些零食。我在商店里買一些零食?？疾闀r(shí)態(tài)?？疾闀r(shí)態(tài)。根據(jù)語(yǔ)境可知，此處指的應(yīng)該是正在準(zhǔn)備做某事，表示正在進(jìn)行的動(dòng)作要用現(xiàn)在進(jìn)行時(shí)，結(jié)構(gòu)是“am/ is/ are doing”，主語(yǔ)students是復(fù)數(shù)，be動(dòng)詞用are，故選B。16．B【詳解】句意：——那個(gè)糟糕的噪音是什么？——學(xué)生們正在準(zhǔn)備聚會(huì)。根據(jù)答語(yǔ)“Sorry, I… on it.”的語(yǔ)境可推斷出，動(dòng)作正在進(jìn)行，應(yīng)用現(xiàn)在進(jìn)行時(shí)，構(gòu)成形式為be do解析：D【詳解】句意：——我可以用你的電腦嗎？——對(duì)不起，我正在用它工作。prepare準(zhǔn)備；is preparing現(xiàn)在進(jìn)行時(shí)；will prepare一般將來(lái)時(shí)；was preparing過(guò)去進(jìn)行時(shí)；has prepared現(xiàn)在完成時(shí)；根據(jù)時(shí)間狀語(yǔ)“now”可知，句子時(shí)態(tài)采用現(xiàn)在進(jìn)行時(shí)。14．A【詳解】句意：你最好現(xiàn)在不要打擾凱西，因?yàn)樗跒槊魈斓臅?huì)議準(zhǔn)備演講。你哥哥正在手機(jī)上錄音。你哥哥正在手機(jī)上錄音?？疾閯?dòng)詞時(shí)態(tài)。故選C。根據(jù)前句“Not now”語(yǔ)境可知，后句的動(dòng)作正在進(jìn)行，應(yīng)用現(xiàn)在進(jìn)行時(shí)，構(gòu)成解析：C【詳解】句意：——去看電影怎么樣？有部叫《嗨，媽媽》的新電影。根據(jù)“Tom, please give me a hand in moving the piano.”及語(yǔ)境可知，此處回答的動(dòng)作是現(xiàn)在正在進(jìn)行的，應(yīng)用現(xiàn)在進(jìn)行時(shí)，結(jié)構(gòu)是“be+doing”，故選C。根據(jù)“Tom, please give me a hand in moving the piano.”及語(yǔ)境可知解析：C【詳解】句意：——湯姆，請(qǐng)幫我搬一下鋼琴。10．C【詳解】句意：——湯姆，請(qǐng)幫我搬一下鋼琴。根據(jù)前句“The zoo keeper is worried”的語(yǔ)境可知，后句動(dòng)作應(yīng)是解析：C【詳解】句意：動(dòng)物園管理員很擔(dān)心，因?yàn)橛慰蛿?shù)量越來(lái)越少。根據(jù)“What’s that noise, Sam?”判斷，此處應(yīng)該用現(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)是：be（am/is/are）+動(dòng)詞的現(xiàn)在分詞。8．B【詳解】句意：——什么聲音，山姆？ ——我弟弟正在玩他的玩具車。根據(jù)“Tony, hurry up! We…for you now.”可知，此處強(qiáng)調(diào)動(dòng)作正在發(fā)生，用現(xiàn)在進(jìn)行時(shí)，故選解析：D【詳解】句意：——托尼，快點(diǎn)！我們現(xiàn)在在等你。故選D。根據(jù)句中“解析：D【詳解】句意：聽(tīng)！這個(gè)男孩又在彈鋼琴了。故選C?？疾楝F(xiàn)在進(jìn)行時(shí)的用法。根據(jù)“Where’s your father, Lily?”可知，此處是詢問(wèn)當(dāng)前的情況，表示正在做某事，用現(xiàn)在進(jìn)行時(shí)，故選解析：D【詳解】句意：——莉莉，你父親在哪里？——他正在廚房做飯。根據(jù)上句“Betty can’t join us in the game”，此處指的是現(xiàn)在發(fā)生的事，故應(yīng)用現(xiàn)在時(shí)，且根據(jù)語(yǔ)境可知，貝蒂不能來(lái)的原因是她正在打掃教室，故句子應(yīng)用現(xiàn)在進(jìn)行時(shí)，其構(gòu)成是am/is/are doing?？疾楝F(xiàn)在進(jìn)行時(shí)。根據(jù)語(yǔ)境可知，英語(yǔ)演講比賽下周舉行，杰克現(xiàn)在應(yīng)該是正在準(zhǔn)備，因此用現(xiàn)在進(jìn)行時(shí)；其結(jié)構(gòu)是：be（am/is /are）+動(dòng)詞的現(xiàn)在分詞。根據(jù)語(yǔ)解析：B【詳解】句意：——我有幾天沒(méi)見(jiàn)到杰克了。2．B【詳解】句意：——我有幾天沒(méi)見(jiàn)到杰克了。考查現(xiàn)在進(jìn)行時(shí)。s time for school. Why not get on the bus?—Linda hasn39。t seen Jack for a couple of days. —He ________ for the English speaking petition which will take place next week.A．will prepare B．is preparing C．has prepared D．was preparing3．Betty can’t join us in the game. She ________ the classroom.A．has cleaned B．was cleaning C．has cleaned D．is cleaning4．—Where is your father, Lily?—He ________ in the kitchen.A．cooked B．cooks C．will cook D．is cooking5．I must leave now. My brother ________ for me outside.A．waits B．waited C．is waiting D．was waiting6．Listen! The boy ________ the piano again.A．plays B．played C．will play D．is playing7．—Tony, hurry up! We ________ for you now.—Just one minute.A．wait B．waited C．have waited D．a(chǎn)re waiting8．— What’s that noise, Sam?— My little brother ________ his toy car.A．played B．is playing C．plays D．was playing9．The zoo keeper is worried because the number of visitors ________ smaller and smaller.A．bee B．a(chǎn)re being C．is being D．have bee10．—Tom, please give me a hand in moving the piano. —Sorry. I ________ my car.A．repair B．repaired C．a(chǎn)m repairing D．have repaired11．—What about going to the cinema? There’s a new movie called Hi, Mom.—Not now, I ________ my brother Tony with his English.A．help B．helped C．a(chǎn)m helping D．have helped12．Now ABC Cinema on Forest Road ________ the old f