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【題目】________ important energy electricity is in our daily life now!

A.HowB.WhatC.What aD.What an

【答案】B

【解析】

句意：電在我們的日常生活中有多么重要！

考查感嘆句。英語感嘆句由what和how引導，what后面跟名詞，how后面跟形容詞或副詞。具體構成如下：（1）what + a/an+形容詞+可數名詞單數+主語+謂語�。�2）what +形容詞+不可數名詞或可數名詞復數+主語+謂語！（3）how+形容詞或副詞+主語+謂語！本句的中心詞helpful是形容詞，可知用how引導此感嘆句；故選B。

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