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
On hearing the joke, she burst into ______.
A．a loud laughter
B．loud laughter
C．loud laughs
D．loud laughing
单项选择题
Some people say that students' progress in school is ______ by environment.
A．effected
B．affected
C．offered
D．afforded
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