【正文】 ，此處強調(diào)動作正在進行，應該用現(xiàn)解析：A【詳解】句意：——湯姆，你的小妹妹在哪里?——她現(xiàn)在正在后院玩。根據(jù)前句“The noise es from the boys.”語境可推知，后句中動作正在進行，應用現(xiàn)在進行時，構成形式為be doing；主語“They”是復數(shù)形式，be用are；have的現(xiàn)在分詞是having?？疾閯釉~時態(tài)。主語he后接be動詞is。故選B。4．B【詳解】句意：——你好，我可以和吉姆講話嗎？——對不起，他正在開一個重要的會?？疾闀r態(tài)。s not at home.”可知，這里是現(xiàn)在進行時，其結(jié)構是be doing的形式。她正在圖書館看書。她正在圖書館看書。prepare準備；is preparing現(xiàn)在進行時；will prepare一般將來時；was preparing過去進行時；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)在進行時。 expect18．—Hey! You nearly hit the tree! What’s up?— Sorry, I ________ the trip to my hometown.A．think about B．a(chǎn)m thinking about C．was thinking about D．thought about19．It dark. Shall I turn on the light？A．gets B．got C．is getting D．was getting20．Now ABC Cinema on Forest Road ________ the old film called Roman Holiday.A．is show B．is showing C．is showed D．is on21．Don’t make any noise, Jim! Your little sister ________ now.A．sleeps B．slept C．is sleeping D．will sleep22．— 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．— Helen, how was your English petition on Monday?— I have no idea, I _________ for the result. I was told it would e out in two days.A．was waiting B．waited C．will wait D．a(chǎn)m waiting24．— 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．prepared25．My father ________ Beijing next week.A．leaves for B．is leaving for C．left D．leaves26．—Lucy, where is Mimi?—She ________ under the chair.A．sleeps B．slept C．is sleeping D．will sleep27．—Lily, where is our father now? Go and get him for lunch. —Just a moment, please. Father ________ a phone call in his room.A．is making B．was making C．makes D．has made28．Xifeng Street is closed today because workers _______ some repairs.A．make B．made C．a(chǎn)re making D．were making29．—Hello! May I speak to Tom?—One moment! He _______ an .A．is sending B．sent C．sends D．was sending30．—Where’s Kelly, Mum?—She ________ a poster for the munity in her bedroom.A．makes B．will make C．made D．is making31．You’d better not go this way. The workers _________ the road. A．have repaired B．a(chǎn)re repairing C．repaired D．will repair32．— 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 talked33．Many children in South Sudan ________ the trouble of hunger at the moment.A．face B．faces C．is facing D．a(chǎn)re facing34．Sorry, you can’t take the eraser away, Tony. I ________ it.A．have used B．used C．was using D．a(chǎn)m using35．Be quiet! The students ________ an English exam.A．take B．a(chǎn)re taking C．took D．have made36．Mum ________ fish in the kitchen. It smells so good.A．cooks B．is cooking C．was cooking D．will cook37．—Maggie, could you help pick up the phone? It ________.—OK, Mum.A．rings B．rang C．will ring D．is ringing38．—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 taken39．B