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
They all enjoyed ______ to play the guitar.
A．learning
B．learn
C．to learn
D．learned
单项选择题
The ______ thing would have been not to say anything.
A．skillful.
B．cunning
C．tactful
D．stupid
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