单项选择题

Either of the students ______ able to dance and sing.

A．be
B．are
C．is
D．have been
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单项选择题
You are late for work again, Miss Jane. You _____ here half an hour earlier.
A．must be
B．could have been
C．may have been
D．should have been
单项选择题
The question is worth ______ again.
A．discussing
B．to discuss
C．discussed
D．discuss
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