单项选择题

Medical research has shown that the widespread of use of cigarettes contributes ______the increase of cancers.

A．to wards
B．for
C．with
D．to
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单项选择题
This is one of those cars that ______in the accident.
A．is damaged
B．was damaged
C．are damaged
D．were damaged
单项选择题
I wish I ______longer this morning, but I had to get up and come to class.
A．could have slept
B．might have slept
C．slept
D．have slept
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