when you leave the room,you mest( )A turn on the light B to turn off the lightC turn off the light C to turn on thelight最好写出中文意思!

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when you leave the room,you mest( )A turn on the light B to turn off the lightC turn off the light C to turn on thelight最好写出中文意思!

when you leave the room,you mest( )A turn on the light B to turn off the lightC turn off the light C to turn on thelight最好写出中文意思!
when you leave the room,you mest( )
A turn on the light B to turn off the light
C turn off the light C to turn on thelight
最好写出中文意思!

when you leave the room,you mest( )A turn on the light B to turn off the lightC turn off the light C to turn on thelight最好写出中文意思!
C 关灯
A开灯
B,C因为有to,而Must后面不能接to,所以淘汰
当你离开房间的时候,你必须--关灯

答案是C
离开房间时,最好把灯关上