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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．
根據答語的語境"你爸爸還沒有回來，我在等他．"判斷設空處的動作"等待"在說話時刻正在進行著，所以用現(xiàn)在進行時．現(xiàn)在進行時的構成是：主語+am/is/are+動詞的現(xiàn)在分詞；主語是I，be動詞用am，故答案為A．

點評 本題考查了動詞的時態(tài)．做題時，一定要特別關注有關的時間短語，這是判斷句子時態(tài)的標志．在沒有時間狀語的情況下可以聯(lián)系上下文根據語境來做出正確判斷．

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