when you leave the room,make sure ____all the lights are turnde off.a.if b when.c whether d that

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when you leave the room,make sure ____all the lights are turnde off.a.if b when.c whether d that
when you leave the room,make sure ____all the lights are turnde off.
a.if b when.c whether d that

when you leave the room,make sure ____all the lights are turnde off.a.if b when.c whether d that
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.

d

if有是否的意思
在离开之前,确保灯是否都关了

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。