单项选择题

80（）

A．concern
B．concerning
C．concerned
D．to concern

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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
单项选择题
76（）

A．she discovered
B．did she discover
C．she did discover
D．does she discover
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