单项选择题

The helicopter could not land because ______.

A．the mountain was too high
B．the mountain-sides were too steep
C．the runway was too narrow
D．the weather was very bad
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The schoolmaster rang up ______.
A．the police
B．the rescue party
C．the Air Force
D．the doctor
单项选择题
She sat there with nothing ______ except play with her cat.
A．to do
B．doing
C．done
D．to be done
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