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(méi)人知道是什么導(dǎo)致這位年輕人在態(tài)度和行為上的這種明顯變化．

解答 答案：D．
本句是考查賓語(yǔ)從句，引導(dǎo)賓語(yǔ)從句的是一個(gè)強(qiáng)調(diào)句型的特殊疑問(wèn)句式：What is/was it that+其他？．強(qiáng)調(diào)的為主語(yǔ)what；眾所周知，賓語(yǔ)從句中的疑問(wèn)句需要使用陳述語(yǔ)序，故排除A和C；B項(xiàng)強(qiáng)調(diào)句式的結(jié)構(gòu)不完整，漏掉了一個(gè)關(guān)鍵詞that，故選D．

點(diǎn)評(píng) 將強(qiáng)調(diào)句型尤其是疑問(wèn)句式放到賓語(yǔ)從句中考查無(wú)形中加大了試題的難度，要求學(xué)生認(rèn)真分析句子結(jié)構(gòu)及內(nèi)容，掌握其基本用法，尤其是要注意在賓語(yǔ)從句中疑問(wèn)句式要用陳述語(yǔ)序等問(wèn)題．

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