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(gè)禽流感病例是由H7N9病毒引起的，其中第一個(gè)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(yǔ)從句，先行詞為The two flu cases；結(jié)合句意"其中第一個(gè)病例發(fā)生在一周之前"應(yīng)該是兩者之中的第一個(gè)，所以用介詞+關(guān)系代詞引導(dǎo)定語(yǔ)從句，因先行詞指物（病例），A和B項(xiàng)不能引導(dǎo)定語(yǔ)從句；所以用of which；故選C．

點(diǎn)評(píng) 對(duì)于定語(yǔ)從句要分清先行詞，以及從句中所缺少的成分，結(jié)合句意正確選擇關(guān)系詞．

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