单项选择题

We must finish the job, no matter () difficult it is.

A.however
B.how
C.whatever
D.what

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单项选择题

We didn't plan to meet; we met () in the street.

A.by the way
B.by chance
C.on purpose
D.in surprise

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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