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【题目】I think it is _______useful robot and it can help a lot in_______earthquake.

A.a; anB.an; anC.an; aD./; a

【答案】A

【解析】

句意:我认为这是一个很有用的机器人,它在地震中帮助很大。

第一空格后面是useful,是辅音音素开头的单词,所以要用a,表示一个;第二空修饰的是earthquake,是一个可数名词,且是以元音音素开头的单词,所以要用不定冠词an,故选A

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