单项选择题

I hope they won't have to wait all day long for the mail to arrive,______

A．will they
B．do they
C．don' t they
D．have they
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单项选择题
National Park conservationists think______ concession stands spoil the natural beauty of the park.
A．of
B．about
C．that
D．a lot
单项选择题
When the tank can carrying poisonous gas ran off the rails the firemen tried to______ the village from all traffic.
A．dismiss
B．insulate
C．isolate
D．expel
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