问题补充:
you turn off all the lights when you leave the classroom.
A. Making sure
B. To make sure
C. Being sure
D. Make sure
答案:
A. Making sure
B. To make sure
C. Being sure
(答案→)D. Make sure
解析:考查祈使句:句意是:当你离开教室时要把所有的灯都关了。根据句式判断应该用祈使句。选D。
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