（）1.the windows are shut _you leave the lab.

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（）1.______the windows are shut _______you leave the lab.
A).Be sure;after B).To be sure;before
C).Make sure;before D).To make sure;after
请写出具体理由为什么选这个,为什么不选这个．

C
A 错是因为after指的是走以后
B 是因为To be sure 中的to ,有了to 的话,To be sure就不能做主语了,而是一个状语,但是在句子中,可见.______the windows 实在主语的.
D 错的原因同B

Remember ______(shut) all the windows before you leave Before you leave the lab,the doors and windows _shut in case She ______the whole afternoon in washing the windows and the So hot in the office.Would you mind ______the windows? ————,leave the room last ought to make sure that windows are Are you going to leave the windows open.翻译下`going为什么加ing I____(close)the windows before I leave. ___the windows before you leave the classroom. ___(shut)the door when you leave the house The windows are all（）.They are not（） _______you can imagine,things are really different from the Is the book _______you are talking about interesting?

（ ）1.______the windows are shut _______you leave the lab.

（）1.the windows are shut _you leave the lab.