单项选择题

They must ______ for us; let's hurry up.

A．wait
B．have been waited
C．waited
D．be waiting
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单项选择题
Smoking is so harmful to personal health that it kills people each year ______ than automobile accidents.
A．seven more times
B．seven times more
C．over seven times
D．seven times
单项选择题
Twenty pounds ______ enough for such a poor family to spend for a month.
A．were
B．being
C．have been
D．was
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