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
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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
单项选择题
______ you understand this rule, you'll have no further difficulty.
A．Once
B．Unless
C．Only
D．Until
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