单项选择题

He enjoys ______ on business trips with his boss.

A．going
B．to go
C．go
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单项选择题
Dr. Naismith thought ______ a few days and invented a kind of ball game.
A．of
B．for
C．on
单项选择题
What a weather! It ______ for four days and no one knows when it will stop.
A．snows
B．is snowing
C．has snowed
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