Question

【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

Answer 1

【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。