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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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
There are few electronic applications _____to raise fears regarding future employment opportunities than robots.
A．likely
B．more likely
C．most likely
D．much likely
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