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

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

单项选择题

A．are
B．have been
C．were
D．has been