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

() your help we were successful.

A. According to
B. But for
C. Owing to
D. As for

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

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