单项选择题

You must make______ clear that no harm comes to her.

A．that
B．it
C．this
D．what
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单项选择题
The woman gathered a lot of______ by writing many best-selling ______.
A．wealths; work
B．wealths; works
C．wealth; work
D．wealth; works
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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