【正文】 r”及后面的now可知，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(gòu)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)?？疾楝F(xiàn)在進行時。故選D。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，故應用現(xiàn)在時，且根據(jù)解析：D【詳解】句意：貝蒂不能參加我們的比賽。故選B。 ——他正在為下周舉行的英語演講比賽做準備。 ——他正在為下周舉行的英語演講比賽做準備?？疾閯釉~時態(tài)辨析。 expect20．—Tom, please give me a hand in moving the piano. —Sorry. I ________ my car.A．repair B．repaired C．a(chǎn)m repairing D．have repaired21．Don’t make any noise, Jim! Your little sister ________ now.A．sleeps B．slept C．is sleeping D．will sleep22．The students in our group ________ the final preparation for the match. We are sure to win.A．made B．a(chǎn)re making C．make D．will make23．You had better not go this way. The workers _________ the road.A．have repaired B．a(chǎn)re repairing C．repaired D．will repair24．My father ________ Beijing next week.A．leaves for B．is leaving for C．left D．leaves25．—Where is your mother, Kitty?—She ________ dinner in the kitchen.A．cooks B．cooked C．is cooking D．will cook26．—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 made27．Xifeng Street is closed today because workers _______ some repairs.A．make B．made C．a(chǎn)re making D．were making28．—Look out! Something ________ down from the tree.—Dear me! It’s too dangerous.A．falls B．fell C．is falling D．was falling29．Look, many people ________ in the park.A．dance B．danced C．a(chǎn)re dancing D．will dance30．Be quiet. Your brother ________ classes online.A．has B．is having C．will have D．had31．—Mary, may I use your ipad for an hour?—Sorry. I ________ on it.A．work B．a(chǎn)m working C．have worked D．worked32．— Tina, the TV show has already been on. Come and watch together. — Wait a moment. I ________ coffee in the kitchen.A．a(chǎn)m making B．have made C．make D．made33．— 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 talked34．— Tom, what’s your sister doing?— She ________ her homework in the study.A．does B．will do C．did D．is doing35．My grandma ________ the old photos. There is a big smile on her face.A．enjoys B．enjoyed C．will enjoy D．is enjoying36．—Jane,where are you?—Dad,I________ the car in the driveway. It is really dirty.A．wash B．will wash C．a(chǎn)m washing D．was washing37．— Ruby, can you help do the dishes?— Just a moment, Mom. I ________ the flowers.A．water B．a(chǎn)m watering C．watered D．have watered38．Mum ________ fish in the kitchen. It smells so good.A．cooks B．is cooking C．was cooking D．will cook39．It’s 4 o’clock in the afternoon. Ms. Green ________ afternoon tea with her friends.A．has B．is having C．had D．was having40．— May I speak to Mr. Brown?— I am sorry. He ________ an important meeting in his office now.A．has B．had C．is ha