【題目】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:辦公室里有許多電腦,確保你在離開前鎖上門。根據(jù)before you leave可知,時間狀語從句不能用一般將來時,而用一般現(xiàn)在時來代替,所以鎖門這件事發(fā)生在將來,故用一般將來時will+動詞原形,故選A。

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