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
Don't forget to walk the dog while I am away,（）

A．can you
B．shall you
C．do you
D．will you
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
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