填空题

Airplanes (able) ______ people to travel great distances rapidly.

【参考答案】

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单项选择题
A．They are talking on the phone.B．They are touring the city together.C．They are looking for a hotel.D．They are checking in at a hotel.
A．They are talking on the phone.
B．They are touring the city together.
C．They are looking for a hotel.
D．They are checking in at a hotel.
填空题
When he arrived at the hospital, he asked worriedly who was (operate) ______ on.
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