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【题目】There are many computers in the office. Make sure _______the door before you leave.

A. you will lock B. locking

C. for locking D. you lock

【答案】A

【解析】句意:办公室里有许多电脑,确保你在离开前锁上门。根据before you leave可知,时间状语从句不能用一般将来时,而用一般现在时来代替,所以锁门这件事发生在将来,故用一般将来时will+动词原形,故选A。

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