单项选择题

He used to play badminton with you, ______

A．didn't he
B．used he
C．did he
D．hadn't he
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单项选择题
To test his theory, the chemist ______ an experiment.
A．set up
B．set out
C．set forth
D．set in
单项选择题
The difference is so small as to be ______.
A．neglectful
B．neglecting
C．negligent
D．negligible
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