单项选择题

If the pain in your leg becomes worse, get it （） at once.

A. to be seen
B. seen to
C. seeing to
D. be seen to

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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
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
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