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【题目】_______ carefully before you hand in your paper please.

A. Checking B. Check

C. To check D. Checked

【答案】B

【解析】

试题分析:句意:交卷之前请认真检查。before引导的是时间状语从句,前面的祈使句是主句,动词用原形。故选B.

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