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【题目】It is said sending messages on QQ is sometimes not safe. You’d better use _________ USB drive to store the important materials.

A.aB.anC.theD./

【答案】A

【解析】

句意:据说在QQ上发信息有时候是不安全的。你最好用一个U盘来储存重要的资料。

考查冠词。根据句意可知,空格处应填入一个不定冠词表泛指,CD选项可排除。空格处后USB中的U以辅音音素开头,故应用不定冠词a。故选A

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