单项选择题

People appreciate ______ with him because he has a good sense of humor.

A．to work
B．to have worked
C．working
D．having worked
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单项选择题
As early as 1637 Ohio made a decision that free, tax supported schools must be established in every town ______ 40 households or more.
A．having
B．to have
C．to have had
D．having had
单项选择题
All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
A．had been canceled
B．have been canceled
C．were canceled
D．having been canceled
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