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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单项选择题
Our team ______ the match yesterday.
A．won
B．beat
C．defeated
D．caught
单项选择题
______is often the case with children, Tom was completely better by the time the doctor arrived.
A．It
B．As
C．What
D．Which
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