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

【答案】B
【解析】句意:網(wǎng)絡(luò)是多么有用的工具呀!What+ a/an+形容詞+名詞的單數(shù),How+ adj./adv.或者是How+ adj.+a/an+單n.,tool是可數(shù)名詞,前要加不定冠詞,故此處要用感嘆詞what。useful是以輔音因素開頭的,用不定冠詞a。根據(jù)題意,故選B。

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