单项选择题

Swimmers are required ______ or make loud noises when they are in the swimming pool.

A. to not dive
B. to dive
C. not to dive
D. not diving
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单项选择题
After he regained consciousness, he seemed ______ about the car crash.
A. to forget completely
B. to have completely forgotten
C. forgetting completely
D. having completely forgotten
单项选择题
The new multipurpose gymnasium is reported to ______ within two years.
A. have completed
B. have been completed
C. having completed
D. having been completed
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