单项选择题

The machine will continue to make much noise ______ we have it repaired.

A. when
B. because
C. if
D. unless
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单项选择题
You’d better ______ the whole article at once.
A. copy
B. copying
C. to copy
D. copied
单项选择题
Seldom ______ my boss in such good mood (心情) since I came to work in this company.
A. I saw
B. I have been
C. have I seen
D. do I see
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