单项选择题

A large fish was slowly swimming through the water, its tai ______ back and forth like the pendulum of a clock.

A．swung
B．was swinging
C．was swung
D．swinging
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单项选择题
______ she wondered if she had made a mistake.
A．Not until long afterwards that
B．Not long until afterwards
C．It was not until long afterwards that
D．It was long afterwards until
单项选择题
During the construction of skyscrapers, cranes are used to ______ building materials to the upper floors.
A．toss
B．tow
C．hoist
D．hurl
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