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4．The two flu cases，________occurred a week ago，were caused by H7N9virus．（　　）
A．the first of whatB．the first of then
C．the first of whichD．the first of whom

分析 這兩個禽流感病例是由H7N9病毒引起的，其中第一個病例發(fā)生在一周之前．

解答 答案：C．
本句的主干為The two flu cases were caused by H7N9virus．其中間部分為非限制性定語從句，先行詞為The two flu cases；結合句意"其中第一個病例發(fā)生在一周之前"應該是兩者之中的第一個，所以用介詞+關系代詞引導定語從句，因先行詞指物（病例），A和B項不能引導定語從句；所以用of which；故選C．

點評 對于定語從句要分清先行詞，以及從句中所缺少的成分，結合句意正確選擇關系詞．

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