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单项选择题

He ______ working till he was seventy years old.

A．kept up
B．kept on
C．kept to
D．kept out
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热门试题

单项选择题All life on the earth ______ off the sun.

A．depends
B．carries
C．keeps
D．goes

单项选择题Experienced teachers make ______ mistakes than beginners.

A．lesser
B．fewer
C．not many
D．very few