【正文】 解析：B【詳解】句意：安靜點?！玫?，媽媽。我正用著呢。face動詞原形；faces第三人稱單數(shù)；is facing現(xiàn)在進行時，主語為單數(shù)形式；are facing現(xiàn)在進行解析：D【詳解】句意：目前，南蘇丹的許多兒童正面臨著饑餓的問題。真的很臟。她臉上掛著燦爛的笑容。考查時態(tài)辨析?？疾楝F(xiàn)在進行時?？疾閯釉~時態(tài)。考查時態(tài)。故選D。do一般現(xiàn)在時，原形； am doing現(xiàn)在進行時；did一般過去時；根據(jù)“Sorry, Amy”拒絕和對方一起出去購物，可知此處指“正在做作業(yè)”，用現(xiàn)在進行時，其謂語動詞構(gòu)成為“be+現(xiàn)在分詞”；故選B。28．B【詳解】句意：——蒂娜，我們出去逛街吧。根據(jù)“Look out!”可知，此處提示說話時某事正在發(fā)生，應(yīng)用現(xiàn)在進行時。26．C【詳解】句意：——當(dāng)心！有東西從樹上掉下來。25．A【詳解】句意：我聽不見你說話。24．A【詳解】句意：——麗麗，我們的父親現(xiàn)在在哪里？去叫他來吃午飯。根據(jù)“now”可知，時態(tài)為現(xiàn)在進行時，結(jié)構(gòu)為：am/is are doing，主語為She，be動詞用is?？疾楝F(xiàn)在進行時。一起來看吧。他們正在開派對。19．B【詳解】句意：——媽媽在哪里？——她正在廚房做飯。我可以和勞拉講話嗎？——對不起，她不在家。think about思考，一般現(xiàn)在時；am thinking about現(xiàn)在進行時；was thinking about過去進行時；thought about一般過去時?？疾闀r態(tài)。結(jié)合語境可知，母親還沒有睡覺，是因為她正在等未歸的哥哥，故句子應(yīng)用現(xiàn)在進行時，故選B。為什么你還不睡？ ——你哥哥還沒有回來。reading 動名詞；am reading動詞的現(xiàn)在進行時；was reading過去進行時；have read動詞解析：B【詳解】句意：——趕緊?？疾闀r態(tài)。根據(jù)語境可知，此時不能幫媽媽洗碗，是因為正在做作業(yè)，應(yīng)用現(xiàn)在進行時，構(gòu)成形式為：be doing?？疾楝F(xiàn)在進行時態(tài)?！@就來。9．B【詳解】句意：現(xiàn)在是下午4點。8．D【詳解】句意：貝蒂不能參加我們的比賽?？疾閯釉~時態(tài)和the number of的用法。根據(jù)前句“Not now”語境可知，后句的動作正在進行，應(yīng)用現(xiàn)在進行時，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。考查現(xiàn)在進行時的用法。根據(jù)“Sorry...”及“I will give it to you later.”可知，抱解析：B【詳解】句意：——杰克，你能把你的照相機借給我嗎？——抱歉，我正在用。 ——他正在為下周舉行的英語演講比賽做準(zhǔn)備?！獩]問題。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．—Jack, can you lend me your camera?—Sorry, I________ it. I will give it to you later.A．used B．a(chǎn)m using C．have used D．was using4．—Can Peter play games with us, Mrs. Hawking?—Wait a minute. He ________ a shower.A．is taking B．taken C．took D．was taking5．—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 helped6．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 bee7．—Hello! May I speak to Tom?—One moment! He _______ an .A．is sending B．sent C．sends D．was sending8．Betty can’t join us in the game. She ________ the classroom.A．has cleaned B．was cleaning C．has cleaned D．is cleaning9．It’s 4 o’clock in the afternoon. Ms. Green ________ afternoon tea with her friends.A．has B．is having C．had D．was having10．—Tony, hurry up! We ________ for you now.—Just one minute.A．wait B．waited C．have waited D．a(chǎn)re waiting11．—Bob, can you take the dog for a walk?—Sorry, Dad. I ________ an online class.A．take B．took C．a(chǎn)m taking D．have taken12．—Candy, could you please help me do the dishes?—Sorry, Mom. I ________ my homework.A．do B．did C．a(chǎn)m doing D．have done13．Ladies and gentlemen, please remain in your seats, fasten your seat belt and bring your seat back. The plane________.A．takes off B．is taking off C．has taken off D．took off14．—Hurry up!—One moment. I ________ my s.A．reading B．a(chǎn)m reading C．was reading D．have read15．—Mom, it’s so late. Why don’t you go to bed?—Your brother hasn’t e back yet. I ________ for him.A．wait B．a(chǎn)m waiting C．has waited D．waited16．—Mary,