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
There are no lights on and no one answer the doorbell. They______ be at home.
A．must not
B．will not
C．should not
D．can not
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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