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
They tried to restrict access to ______ they believed to be dangerous areas.
A. which
B. what
C. that
D. everywhere
单项选择题
As a ______ actor, he can perform, sing, dance and play several kinds of musical instruments.
A. sophisticated
B. flexible
C. versatile
D. productive
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