单项选择题

A large fish was slowly swimming through the water, its tail ______ 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
I'll be very glad that you agree to ______ this matter.
A. look up
B. look for
C. look over
D. look into
单项选择题
The problem is believed ______ at the meeting two days ago.
A. to have discussed
B. to have been discussed
C. being discussed
D. having been discussed
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