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来看看这道英语语法题____that you close all the doors and windows befor

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来看看这道英语语法题
____that you close all the doors and windows before you leave the lab.
下划线处应填 A.Make sure B.To make sure C.Making sure D.Be made sure
____that you close all the doors and windows before you leave the lab.
离开实验室的时候请将所有门窗关好.
A.Make sure B.To make sure
C.Making sure D.Be made sure
本题答案:A.Make sure
before you leave the lab 是时间状语,修饰前面的祈使成分.
make sure that ...请务必.