单项选择题

The people are fully aware ______ they have before them problems and difficulties of various kinds.

A．of that
B．what
C．that
D．which
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单项选择题
If motorists had to pay an extra tax to drive in cities, they ______ their ears a lot less.
A．use
B．will use
C．used
D．would use
单项选择题
Five minutes earlier, ______ we could have caught the last train.
A．of
B．but
C．and
D．so
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