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10．No one in the office knew ____ caused this obvious change in the young man's behavior and attitude．（　　）
A．what was itB．what it was
C．what was it thatD．what it was that

分析 辦公室里沒人知道是什么導致這位年輕人在態度和行為上的這種明顯變化．

解答 答案：D．
本句是考查賓語從句，引導賓語從句的是一個強調句型的特殊疑問句式：What is/was it that+其他？．強調的為主語what；眾所周知，賓語從句中的疑問句需要使用陳述語序，故排除A和C；B項強調句式的結構不完整，漏掉了一個關鍵詞that，故選D．

點評 將強調句型尤其是疑問句式放到賓語從句中考查無形中加大了試題的難度，要求學生認真分析句子結構及內容，掌握其基本用法，尤其是要注意在賓語從句中疑問句式要用陳述語序等問題．

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