单项选择题

They rushed into the hall ______ the door opened.

A．when
B．if
C．after
D．as soon as
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You will make the things worse ______ you refuse to apologize for that.
A．before
B．if
C．when
D．which
单项选择题
Don t forget to lock the door ______ you leave the room.
A．after
B．since
C．for
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