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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单项选择题
George did ______ than anyone else.
A．much work
B．more work
C．work much
D．work more
单项选择题
--You're not a freshman, are you --______, I am a second-year student.
A．Yes, I'm not
B．No, I am
C．No, I'm not
D．Yes, I am
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