单项选择题

At last she left her house and got to the airport, only () the plane flying away.

A. having seen
B. to have seen
C. to see
D. saw

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单项选择题
They are teachers and don’t realize () to start and run a company.

A. what it takes
B. what takes it
C. what they take
D. what takes them
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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