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【题目】________ useful tool the Internet is!
A.What an
B.What a
C.How
D.How a

【答案】B
【解析】句意:网络是多么有用的工具呀!What+ a/an+形容词+名词的单数,How+ adj./adv.或者是How+ adj.+a/an+单n.,tool是可数名词,前要加不定冠词,故此处要用感叹词what。useful是以辅音因素开头的,用不定冠词a。根据题意,故选B。

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