D be turned off
sth must be turned off before.
The lights must___before you leave the classroom
The lights must___before you leave the classroom
A.turn on B.turn off C.be turning on D.be turned off
A.turn on B.turn off C.be turning on D.be turned off
英语人气:258 ℃时间:2019-12-08 11:28:06
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