单项选择题

The large passenger jets have made the traffic problems at airports ______.

A．the worse than before
B．worse than ever before
C．more bad as before
D．more bad than it was
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单项选择题
Electrical energy may be divided into two components ______ as positive and negative.
A．distinguished
B．specified
C．separated
D．indicated
单项选择题
______ at the price list, he'd have known what to expect.
A．Had Mr. Robinson looked
B．If Mr. Robinson looked
C．If Robinson would have looked
D．Had Mr. Robinson been looking
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