【正文】 時；C是過去進行時；D是一般過去時。根據(jù) tomorrow及選項，可知謂語構(gòu)成用am+ flying，表示將來。17．C【詳解】句意：——明天我將坐飛機去北京。為什么不上車呢？——琳達還沒來。根據(jù)語境可知，此處指的應(yīng)該是正在準(zhǔn)備做某事，表示正在進行的動作要用現(xiàn)在進行時，結(jié)構(gòu)是“am/ is/ are doing”，主語students是復(fù)數(shù)，be動詞用are，故選B。takes off動詞三單；is taking off現(xiàn)在進行時；has taken of解析：B【詳解】句意：女士們，先生們，請留在座位上，系好安全帶，請將座椅靠背調(diào)整好。故解析：C【詳解】句意：——Candy，你能幫我洗碗嗎？——對不起，媽媽。她正在打掃教室。根據(jù)“What’s that noise, Sam?”判斷，此處應(yīng)該用現(xiàn)在進行時，其結(jié)構(gòu)是：be（am/解析：B【詳解】句意：——什么聲音，山姆？ ——我弟弟正在玩他的玩具車。9．C【詳解】句意：——大衛(wèi)，你爸爸在哪里？ ——他正在花園里洗車。他正在洗碗。他們正在開派對。故選C?？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。 ——他正在為下周舉行的英語演講比賽做準(zhǔn)備?！獩]問題。 expecting C．Were。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．—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 helped4．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 bee5．I must leave now. My brother ________ for me outside.A．waits B．waited C．is waiting D．was waiting6．I can’t lend you my English book, because I _______ it these days.A．use B．have used C．used D．a(chǎn)m using7．The noise es from the boys. They _______ a party.A．have B．a(chǎn)re having C．will have D．have had8．—Where is John?—He is in the kitchen. He ________ the dishes now.A．will wash B．is washing C．washes D．washed9．—Where is your father, David?—He ________ the car in the garden.A．will wash B．washed C．is washing D．was washing10．— What’s that noise, Sam?— My little brother ________ his toy car.A．played B．is playing C．plays D．was playing11．Betty can’t join us in the card game. She ________ the classroom.A．has cleaned B．was cleaning C．has cleaned D．is cleaning12．—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．—What’s the terrible noise?—The students ________ for a party.A．have prepared B．a(chǎn)re preparing C．prepare D．will prepare15．Listen! Someone __________ in the next room.A．sings B．sang C．was singing D．is singing16．—It39。你哥哥正在手機上錄音。2．B【詳解】句意：——我有幾天沒見到杰克了。根據(jù)語境可知，英語演講比賽下周舉行，杰克現(xiàn)在應(yīng)該是正在準(zhǔn)備，因此用現(xiàn)在進行時；其結(jié)構(gòu)是：be（am/is /are）+動詞的現(xiàn)在分詞。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)成形式為be doing；主語“I”是第一人稱單數(shù)形式，故助動詞應(yīng)用am；help的現(xiàn)在分詞是helping。5．C【詳解】句意：我現(xiàn)在必須離開了，我哥哥正在外面等我。根據(jù)“I can’t lend you my English book...”可知，我不能把我的英語書借給你，說明這解析：D【詳解】句意：我不能把我的英語書借給你，因為這些天我在用它。他們正在開派對。他正在洗碗?？疾楝F(xiàn)在進行時的用法。故選B。故選D。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。takes off動詞三單；is taking off現(xiàn)在進行時；has taken off現(xiàn)在完成時；took off一般過去時；根據(jù)“Ladies and gentlemen, please remain in your seats, fasten your