What happens when ______water boils?

A. a B. An

C. the D. /

 

D

【解析】

試題分析：句意:當(dāng)水沸騰的時(shí)候發(fā)生了什么？a/an是不定冠詞，修飾可數(shù)名詞單數(shù)，表示泛指；the 是定冠詞，表示特指；根據(jù)句意可知，這里是when引導(dǎo)的時(shí)間狀語(yǔ)從句，從句中的主語(yǔ)water前面不需要加冠詞。故選D。

考點(diǎn)：考查冠詞。

 

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