单项选择题

It's quite difficult () whether Joe will be fit for the job.

A.see
B.to see
C.seeing
D.to be seen

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单项选择题

There are three colors in the British flag, (), red, white and blue.

A.rarely
B.namely
C.really
D.naturally

单项选择题

A．because
B．for
C．of
D．with

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