The practice of hanging clothes across the street is a mon in many parts of the city.
A. look
B. sign
C. sight
D. appearance
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A. look
B. sign
(答案→)C. sight
D. appearance
解析： look/appearance外表； sign标志、迹象； sight风景、视力。结合句意，“在城市的很多地方，衣服穿街晾晒已成一道风景。” 故选C项。