单项选择题

I______ the book. I may well borrow one from the library.

A．need to have bought
B．need have bought
C．needed not bought
D．needn't have bought
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单项选择题
We are firmly______ to the practice of power politics.
A．objected
B．opposed
C．opposing
D．conflicting
单项选择题
The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
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