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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It ______ John and Kate who helped me the other day.
A. is
B. was
C. are
D. were
单项选择题
George did ______ than anyone else.
A. much work
B. more work
C. work much
D. work more
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