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

A. Checking B. Check

C. To check D. Checked

【答案】B

【解析】

試題分析：句意：交卷之前請(qǐng)認(rèn)真檢查。before引導(dǎo)的是時(shí)間狀語(yǔ)從句，前面的祈使句是主句，動(dòng)詞用原形。故選B.

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