单项选择题

Paul doesn't have to be made ______ . He is always a hard-working student.

A．study
B．to study
C．studied
D．studying

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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

— She asked you when ______ again— Tell her that I'll let her know when he______.

A．he comes, comes
B．will he come, will come
C．he comes, will come
D．he will come, comes

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