18．He kept looking at her，wondering whether he        her somewhere．（　�。�
A．sawB．has seenC．seesD．had seen

分析 他不停地看著她，不知道自己是否在什么地方見過她．

解答 答案：D
根據(jù)"He kept looking at her"使用了一般過去時可知，此處的"見過她"是發(fā)生在過去"他不停地看著她"之前的動作，應(yīng)使用過去完成時；故選D．

點評 本題考查了過去完成時（had+done）的用法；首先應(yīng)根據(jù)句中已知的時態(tài)以及句意，判斷出此處動作發(fā)生的時間；其次應(yīng)了解過去完成時表示的是發(fā)生在過去之前的動作；最后應(yīng)熟練掌握各時態(tài)的意義及用法區(qū)別．

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