单项选择题

The teacher warned that whoever was caught （） during the test would be punished.

A. cheat
B. cheating
C. to cheat
D. to be cheating

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单项选择题
（） on a clear day, far from the city crowds, the mountains give him a sense of infinite peace.

A. Walking
B. If walking
C. While walking
D. When one is walking
单项选择题
He wore dark glasses to avoid （）.

A. recognizing
B. recognized
C. being recognized
D. to be recognized
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