单项选择题

It is nice to go for a walk ______a summer evening.

A．on
B．during
C．in
D．at
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单项选择题
Mr. Smith ______working till he was seventy years old.
A．kept up
B．kept on
C．kept to
D．kept out
单项选择题
Forty percent ______stopped smoking in that company.
A．has
B．is
C．have
D．are
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