【正文】 在進(jìn)行時(shí)表示“正在圖書館學(xué)習(xí)”，其結(jié)構(gòu)為be doing；主語“he”是第三人稱單數(shù)，be動(dòng)詞用is。他在哪里？——哦，他在圖書館學(xué)習(xí)?？疾楝F(xiàn)在進(jìn)行時(shí)。13．C【詳解】句意：——我在教室里找不到邁克了?？疾闀r(shí)態(tài)。takes off動(dòng)詞三單；is taking off現(xiàn)在進(jìn)行時(shí)；has taken of解析：B【詳解】句意：女士們，先生們，請(qǐng)留在座位上，系好安全帶，請(qǐng)將座椅靠背調(diào)整好。飛機(jī)正在起飛。故選D?？疾闀r(shí)態(tài)?？疾闀r(shí)態(tài)。故選A?？疾閯?dòng)詞時(shí)態(tài)。我真得要走了?？疾閯?dòng)詞時(shí)態(tài)。我真得要走了。故選D?？疾楝F(xiàn)在進(jìn)行時(shí)。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)解析：D【詳解】句意：貝蒂不能參加我們的比賽。她正在打掃教室。故選B。考查動(dòng)詞時(shí)態(tài)?？疾閯?dòng)詞時(shí)態(tài)。故選C。根據(jù)語境及“at the moment”可知，打來電話的時(shí)候，布朗先生正在開會(huì)，時(shí)態(tài)用現(xiàn)在進(jìn)行時(shí)，結(jié)構(gòu)為am/is/are doing。根據(jù)語境及“at the moment”可知，打來電話的時(shí)候，布朗先生正在開會(huì)，時(shí)態(tài)用現(xiàn)解析：C【詳解】句意：——我能和布朗先生通電話嗎？——很抱歉，他現(xiàn)在正在辦公室召開重要的會(huì)議。7．C【詳解】句意：——我能和布朗先生通電話嗎？——很抱歉，他現(xiàn)在正在辦公室召開重要的會(huì)議?？疾闀r(shí)態(tài)?！獙?duì)不起?？疾闀r(shí)態(tài)?！獙?duì)不起。故選B。will wash動(dòng)詞的一般將來時(shí)形式；is washing動(dòng)詞的現(xiàn)在進(jìn)行時(shí)形式；washes動(dòng)詞的三單形式；washed動(dòng)詞的過去式。他正在洗碗?？疾楝F(xiàn)在進(jìn)行時(shí)。5．B【詳解】句意：——約翰在哪里？——他在廚房里。主語he后接be動(dòng)詞is。考查現(xiàn)在進(jìn)行時(shí)。故選B。根據(jù)“now”可知要用現(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)為be doing。4．B【詳解】句意：——你好，我可以和吉姆講話嗎？——對(duì)不起，他正在開一個(gè)重要的會(huì)?？疾闀r(shí)態(tài)?？疾闀r(shí)態(tài)。故選C。s not at home.”可知，這里是現(xiàn)在進(jìn)行時(shí)，其結(jié)構(gòu)是be doing的形式。read讀書，原形；reads讀書，第三人稱單數(shù)； is reading 正在讀書，現(xiàn)在進(jìn)行時(shí)；was reading正在讀書，過去進(jìn)行時(shí)。她正在圖書館看書。read讀書，原形；reads讀書，第三人稱單數(shù)； is reading 正在讀書，現(xiàn)在進(jìn)行解析：C【詳解】句意：——你好。她正在圖書館看書。2．C【詳解】句意：——你好。wear穿；根據(jù)“I’ll have it changed immediately”可知在說話的時(shí)候“毛衣穿反”這個(gè)動(dòng)作正在進(jìn)行，用現(xiàn)在進(jìn)行時(shí)，結(jié)構(gòu)是：am/is/are + doing；主語是“You”，be動(dòng)詞用are。——哦，天吶！我馬上把它換過來。wear穿；根據(jù)“I’ll have it changed immediately解析：B【詳解】句意：——Lena，我想今天早上你很匆忙?！叮靺?！我馬上把它換過來。 expect19．—Where is Frank?—He _________ to music in his room.A．listens B．is listening C．listened D．was listening20．— Where are the officers? — Look! They ________ the elephant in the palace now.A．touched B．will touch C．touch D．a(chǎn)re touching21．— Tom, what’s your sister doing?— She ________ her homework in the study.A．does B．will do C．did D．is doing22．— Mom, I’m busy making the bed. Can you give me a hand? — Wait a moment. I ________ the floor.A．a(chǎn)m cleaning B．will clean C．was cleaning D．have cleaned23．— Hi, Tom. I can’t find David anywhere. Do you know where he is?—Oh, he ________ for tomorrow’s exam at home.A．prepares B．is preparing C．has prepared D．prepared24．—Lucy, where is Mimi?—She ________ under the chair.A．sleeps B．slept C．is sleeping D．will sleep25．I can’t hear you. I ______ to an English speech.A．a(chǎn)m listening B．listen C．was listening26．— May I speak to Mr. Brown?— I am sorry. He ________ an important meeting in his office now.A．has B．had C．is having D．will have27．—Tina, let’s go out for shopping.—Sorry, Amy. I __________ my homework.A．do B．a(chǎn)m doing C．did28．Be quiet. Your brother ________ classes online.A．has B．is having C．will have D．had29．Listen! The birds ________ happily in the tree outside the window.A．sing B．sang C．a(chǎn)re singing D．were singing30．— Dad, I can’t work out this math problem. Can you give me a hand?— Wait a moment. I ________ on the phone.A．a(chǎn)m talking B．will talk C．was talking D．have talked31．—Has your aunt finished writing her novel?—Not yet. She ________ it these days.A．wrote B．writes C．is writing D．will write32．—I can’t find David. Where is he?— He________ for tomorrow’s petition at home.A．prepare