单项选择题

Paul doesn't have to be made ______. He always works hard.

A．study
B．to study
C．studied
D．studying
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单项选择题
It's nearly seven o'clock. Jack ______ be here at any moment.
A．must
B．need
C．should
D．can
单项选择题
How beautifully she sings! I have never heard ______.
A．the better voice
B．a good voice
C．the best voice
D．a better voice
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