题目内容

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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A. have completed
B. have been completed
C. having completed
D. having been completed

A. to be known that
B. it that to be known
C. it to be known that
D. that it to be known

A. 呼吸性酸中毒
B. 呼吸性碱中毒
C. 呼吸性酸中毒合并代谢性酸中毒
D. 呼吸性酸中毒合并代谢性碱中毒
E. 呼吸性酸中毒合并代谢性酸中毒和代谢性碱中毒

A. to forget completely
B. to have completely forgotten
C. forgetting completely
D. having completely forgotten