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
Televisions enable us to see things happen almost at the exact moment ______.
A．which they are happening
B．they are happening
C．which they happen
D．they have happened
单项选择题
The green team ______ themselves on the red team by winning the final.
A．revenged
B．reversed
C．reverted
D．revealed
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