单项选择题

______he is a hard-working person, he has not been successful in business.

A. Since
B. Although
C. Unless
D. However
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单项选择题
Twenty dollars______obviously too much to pay for such a small item.
A. were
B. are
C. is
D. have been
单项选择题
If I ______out of ink, I would have finished writing the paper.
A. shouldn't run
B. haven't run
C. hadn't run
D. didn't run
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