（2014年北京市西城區(qū)高三5月二模試題）31. A person who has never tasted bitter won’t know ______ sweet is.
A．whichB．whatC．whenD．why
B
本句中的動詞know后面是一個賓語從句，這個賓語從句的主語是sweet，系動詞is后面缺少了表語。CD兩項是連詞副詞，只能在句中做狀語，不能做表語。Which一直都有疑問的意思，表示具體范圍之內(nèi)的“哪一個”。所以使用what，既引導(dǎo)起這個賓語從句，也在賓語從句中做系動詞is的表語。故B正確。
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