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

I am looking forward to ______ from you as soon as possible.

[A] hear
[B] be heating
[C] heating
[D] have heard

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