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【题目】What ________ useful piece of advice! It can help students with their homework.

A.aB.anC./

【答案】A

【解析】

句意:什么有用的一条建议!它可以帮助学生做作业。

a/an不定冠词,表示泛指,意为“一个”,a用于辅音音素前,an用于元音音素前。advice建议,不可数,但是可以和表单位的数量词连用。piece条,片,块,a piece of 一条……,a piece of advice 一条建议;useful以辅音音素开头,故选A

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