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

【答案】B
【解析】考查祈使句。句意:交卷之前請認真檢查。before引導的是時間狀語從句,前面的祈使句是主句,動詞用原形。故選B。

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