题目内容
4.The two flu cases,________occurred a week ago,were caused by H7N9virus.( )A. | the first of what | B. | the first of then | ||
C. | the first of which | D. | the first of whom |
分析 这两个禽流感病例是由H7N9病毒引起的,其中第一个病例发生在一周之前.
解答 答案:C.
本句的主干为The two flu cases were caused by H7N9virus.其中间部分为非限制性定语从句,先行词为The two flu cases;结合句意"其中第一个病例发生在一周之前"应该是两者之中的第一个,所以用介词+关系代词引导定语从句,因先行词指物(病例),A和B项不能引导定语从句;所以用of which;故选C.
点评 对于定语从句要分清先行词,以及从句中所缺少的成分,结合句意正确选择关系词.
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