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
They assured us that()was waiting for us they were there to share it.

A. what
B. whatever
C. it
D. whoever
单项选择题
() she wondered if she had made a mistake.

A. Not until long afterwards that
C. It was not until long afterwards that
B. Not long until afterwards
D. It was long afterwards until
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