单项选择题

It was very kind of you to do the washing-up, but you ______it.

A．mustn't have done
B．wouldn't have done
C．mightn't have done
D．didn't have to do
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单项选择题
They are going to have the serviceman ______ an electric fan in the office tomorrow.
A．install
B．to install
C．to be installed
D．installed
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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