单项选择题

You must make ______ clear that no harm comes to her.

A．that
B．it
C．this
D．/
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单项选择题
Everyone is busy working. You can't stay here ______ you keep quiet.
A．when
B．once
C．if
D．unless
单项选择题
I first met Mary three years ago when we ______ in a middle school together.
A．have worked
B．had been working
C．were working
D．had worked
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