单项选择题

The schoolmaster rang up ______.

A．the police
B．the rescue party
C．the Air Force
D．the doctor
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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
单项选择题
The group of boys had to stop because ______.
A．they had reached the peak
B．one of the boys was badly injured
C．one of the boys was sick
D．they had to return to the hut
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