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
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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
单项选择题
When I try to understand _____that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
A．why it does
B．what it does
C．what it is
D．why it is
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