【正文】 udying B．studied C．is studying D．studies16．—What’s the terrible noise?—The students ________ for a party.A．have prepared B．a(chǎn)re preparing C．prepare D．will prepare17．—It39。根據(jù)“Let’s go and help her”可知，此處指讓我們?nèi)椭谧鐾盹埖哪棠?，故為現(xiàn)在進(jìn)行時，其結(jié)構(gòu)為am/is/are doing。4．D【詳解】句意：貝蒂不能參加我們的比賽。plays動詞第三人稱單數(shù)形式；played表一般過去時；will play表一般將來時；is playing表現(xiàn)在進(jìn)行時。8．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。考查動詞時態(tài)辨析。由“I really need to go now. My children…for me at school”可知解析：A【詳解】句意：請原諒我。飛機正在起飛。17．B【詳解】句意：——該上學(xué)了?！娴?？ 我聽說他明年要去美國。A是一般現(xiàn)在時；B是現(xiàn)在進(jìn)行時；C是過去進(jìn)行時；D是一般過去時。考查現(xiàn)在進(jìn)行時。我到處找不到戴維。我在聽一個英語演講。我正在做作業(yè)。考查動詞時態(tài)。我們一定會贏。我正用著呢。根據(jù)上文“could you help pick up the phone”，結(jié)合麥琪的肯定回答，可知ring是正在發(fā)生的動作，需用be doing現(xiàn)在進(jìn)行時結(jié)構(gòu)。run out用完，用盡，是一個動詞短語，不能用于被動語態(tài)。由此可推斷我正在用，稍后借給你，符合語境。考查動詞時態(tài)。我稍后給你。我必須在沒油之前趕到加油站。35．D【詳解】句意：——麥琪，你能幫我接電話嗎？它在響。根據(jù)“Where’s Nick?”可知要回答現(xiàn)在在做什么，用現(xiàn)在進(jìn)行時，其結(jié)構(gòu)為am/is/are doing。根據(jù)“Sorry, I can’t…Would you mind going later?”可知，現(xiàn)在不行，提議晚點去，所以此處描述正在做的事，用現(xiàn)在進(jìn)行時。根據(jù)“Be quiet.”及語境可知，此處表達(dá)的動作是正在進(jìn)行的，應(yīng)用現(xiàn)在進(jìn)行時，故選B?！炷?！太危險了?？疾楝F(xiàn)在進(jìn)行時的用法。故選B。根據(jù)“Tony, hurry up! We…for you now.”可知，此處強調(diào)動作正在發(fā)生，用現(xiàn)在進(jìn)行時，故選D。A是一般現(xiàn)在時；B是現(xiàn)在進(jìn)行時；C是過去進(jìn)行時；D是一般過去時。——真的？ 我聽說他明年要去美國。故選C。prepare準(zhǔn)備；is preparing現(xiàn)在進(jìn)行時；will prepare一般將來時；was preparing過去進(jìn)行時；has prepared現(xiàn)在完成時；根據(jù)時間狀語“now”可知，句子時態(tài)采用現(xiàn)在進(jìn)行時。根據(jù)前句“The zoo keeper is worried”的語境可知，后句動作應(yīng)是正在進(jìn)行，故時態(tài)應(yīng)用現(xiàn)在進(jìn)行時，構(gòu)成形式為：be doing，故排除A、D項；the number of，表示“……的數(shù)量”，作主語時，謂語動詞用單數(shù)形式，故排除B項。解析：C【詳解】句意：看，許多人在公園里跳舞。故選B。根據(jù)“I must leave now.”可知，我哥哥現(xiàn)在正在外面等我，時態(tài)是現(xiàn)在進(jìn)行時，結(jié)構(gòu)：am/is/are+解析：C【詳解】句意：我現(xiàn)在必須離開了，我哥哥正在外面等我。3．D【詳解】句意：——邁克，那是什么聲音？——我的弟弟現(xiàn)在正在玩他的玩具汽車。 expect20．—Tony, hurry up! We ________ for you now.—Just one minute.A．wait B．waited C．have waited D．a(chǎn)re waiting21．— Where is Tom?— Look! He ________with the teacher over there.A．talk B．talks C．talked D．is talking22．You had better not go this way. The workers _________ the road.A．have repaired B．a(chǎn)re repairing C．repaired D．will repair23．— 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．—How do you find your pany?—A little worried. We ________ ground as a leader in the field of IT with the others speeding up development.A．a(chǎn)re losing B．were losing C．lost D．have lost25．I can’t hear you. I ______ to an English speech.A．a(chǎn)m listening B．listen C．was listening26．—Look out! Something ________ down from the tree.—Dear me! It’s too dangerous.A．falls B．fell C．is falling D．was falling27．—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．—Hello! May I speak to Tom?—One moment! He _______ an .A．is sending B．sent C．sends D．was sending30．—Ethan, let’s go to play basketball, shall we?—Sorry, I can’t. I ________Yao Ming’s game. Would you mind going later?A．watch B．have watched C．a(chǎn)m watching D．was watching31．The s