16．I went to see Dr．Smith yesterday，only to be told that he _______ for leave．（　�。�
A．would askB．was askingC．has askedD．had asked

分析 昨天我去看望Smith先生，卻被告知他已經(jīng)請假了．

解答 答案：D．
前面主句I went to see Dr．Smith yesterday的時態(tài)為一般過去時，而后面that引導的從句中請假的動作發(fā)生在我去看望Smith先生之前，即表示"過去的過去"，所以用過去完成時．A項表示過去將來時，表示過去將要發(fā)生的動作，B項為過去進行時，表示過去某一時刻正在進行的動作；C項為現(xiàn)在完成時，表示過去的某個動作對現(xiàn)在造成的影響和結(jié)果．

點評 熟悉每個時態(tài)的具體用法并結(jié)合具體的句子語境來判斷正確答案．

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