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
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
单项选择题
If you ______ smoking and drinking, your health will improve soon.
A．gave up
B．give up
C．had given up
D．will give up
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