单项选择题

22（）

A．had
B．has
C．had been
D．was being

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单项选择题
Robert Fulton's invention, an airphibian, can best be described as ______.
A．a helicopter
B．a solo flying machine
C．a flying car
D．an airplane
单项选择题
Jet belts and rocket belts were developed ______.
A．20-30 years ago
B．50 years ago
C．recently
D．30 years ago
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