What happens when water boils?A. a B. AnC. the D. / 题目和参考答案——青夏教育精英家教网—

题目内容

What happens when ______water boils?

A. a B. An

C. the D. /

【解析】

试题分析：句意:当水沸腾的时候发生了什么？a/an是不定冠词，修饰可数名词单数，表示泛指；the 是定冠词，表示特指；根据句意可知，这里是when引导的时间状语从句，从句中的主语water前面不需要加冠词。故选D。

考点：考查冠词。

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