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
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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
单项选择题
I first met Lisa three years ago when we ______ at a radio station together.
A．have worked
B．had been working
C．were working
D．had worked
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