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( )you turn off all the lights when you leave the classroom.Ato make sure Bmake sure Cmaking sureDbeing sure选哪一个,为社么?

题目详情
( )you turn off all the lights when you leave the classroom.Ato make sure Bmake sure Cmaking sure
Dbeing sure选哪一个,为社么?
▼优质解答
答案和解析
B
这是个祈使句,必须要有谓语动词