作业帮befor you leave the house,make sure i t___be closedis closedclosed
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befor you leave the house,make sure i t___be closedis closedclosed
befor you leave the house,make sure i t___
be closed
is closed
closed
befor you leave the house,make sure i t___be closedis closedclosed
is closed
时态是现在时所以用is
close和it是it被close,所以用被动语态