when you leave the room,make sure ____all the lights are turnde off.a.if b when.c whether d that
问题描述：
when you leave the room,make sure ____all the lights are turnde off.
a.if b when.c whether d that
答
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。
答
if有是否的意思
在离开之前，确保灯是否都关了
答
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.
答
d