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    精英家教网 > 高中英语 > 题目详情
    12．A person who has never tasted bitter won't know ______ sweet is．（　　）
    A．whichB．whatC．whenD．why

    分析 一个从来没有经历过苦难的人是不会知道幸福是什么的．

    解答 答案：B
    person后面有个who引导的定语从句．动词know后面是一个宾语从句，其主语是sweet，系动词is后面缺表语．CD两项是连词副词，只能在句中做状语，不能做表语．Which表示疑问，强调具体范围之内的"哪一个"．所以使用what，既引导起这个宾语从句，也在宾语从句中做系动词is的表语．故B正确．

    点评 对于宾语从句的引导词要明白其在句中所充当的成分，作宾语时常可省略．如I don't know that he has been abroad．

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