珊瑚豆怎么繁殖:when you leave the room,make sure ____all the lights are turnde off.

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a. if b when. c whether d that
请高手赐教

D
make sure表示“务必”,“确信”,“弄明白”,后面常接 of/about sth.或that引导的宾语从句。make sure后通常不接不定式。

if有是否的意思
在离开之前,确保灯是否都关了

d

when you leave the room,make sure ____all the lights are turned off.

选D,当你离开屋子前,确认灯已经被关了。