5．--Mum，it's late．Why are you still here？
--Dad hasn't come back yet．I          for him．（　�。�
A．am waitingB．was waitingC．waited

分析 --媽媽，很晚了，你為什么還在這里？
--你爸爸還沒有回來，我在等他．

解答 答案：A．
根據(jù)答語的語境"你爸爸還沒有回來，我在等他．"判斷設(shè)空處的動(dòng)作"等待"在說話時(shí)刻正在進(jìn)行著，所以用現(xiàn)在進(jìn)行時(shí)．現(xiàn)在進(jìn)行時(shí)的構(gòu)成是：主語+am/is/are+動(dòng)詞的現(xiàn)在分詞；主語是I，be動(dòng)詞用am，故答案為A．

點(diǎn)評 本題考查了動(dòng)詞的時(shí)態(tài)．做題時(shí)，一定要特別關(guān)注有關(guān)的時(shí)間短語，這是判斷句子時(shí)態(tài)的標(biāo)志．在沒有時(shí)間狀語的情況下可以聯(lián)系上下文根據(jù)語境來做出正確判斷．

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