单项选择题

Professor Smith as well as his children ______ on running every morning.

A. keep
B. keeps
C. keeping

D. kept
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单项选择题
We are studying English hard ______ our country better in the future.
A. serve
B. to serve
C. serving

D. served
单项选择题
He was very foolish to ______ like that.
A. behave
B. do

C. tell

D. make
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