单项选择题

______ those bad habits, he would not have got liver cancer.

A．Was he giving up
B．Did he give up
C．If he gave up
D．Had he given up
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The world longest bridge across the Bay is now ______ construction.
A．at
B．under
C．in
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单项选择题
The stove is still on. It ______ on. I had turned it off myself and I checked it twice.
A．can't be
B．mustn't be
C．couldn't have been
D．mustn't have been
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