【题目】_______ carefully before you hand in your paper please.
A. Checking B. Check
C. To check D. Checked
在线课程【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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