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【题目】A person who has never tasted bitter won’t know ______ sweet is.

A. which B. what C. when D. why

【答案】B

【解析】本句中的动词know后面是一个宾语从句,这个宾语从句的主语是sweet,系动词is后面缺少了表语。CD两项是连词副词,只能在句中做状语,不能做表语。Which一直都有疑问的意思,表示具体范围之内的“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。

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