单项选择题

Forty percent ______ stopped smoking in that company.

A. has
B. is
C. have
D. are
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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
It ______ John and Kate who helped me the other day.
A. is
B. was
C. are
D. were
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