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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He wore dark glasses to avoid （）.

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B. recognized
C. being recognized
D. to be recognized
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Who （） has read Tolstoy’s great novels can forget their fascination.

A. who
B. which
C. that
D. ever
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