单项选择题

I doubt if it is ______ for you to read that book.

A．worth
B．worthy
C．worthwhile
D．valuable
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单项选择题
They ______ us because of the noise then.
A．mustn"t have heard
B．needn"t have heard
C．couldn"t have heard
D．might not heard
单项选择题
He ought to go by plane, ______
A．ought he
B．shouldn"t he
C．won"t he
D．wouldn"t he
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