单项选择题

"You are very selfish. It's high time you______ that you are not the most important person in the world, "Edgar said to his boss angrily.

A．realized
B．have realized
C．realize
D．should realize
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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
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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