There are many people on the street. Some are standing still others are walking about. A. w——青夏教育精英家教网—

摘要： There are many people on the street. Some are standing still others are walking about. A. where B. when C. while D. but

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There are many people on the street. Some are standing still _____ others are walking about.

A. where B. when C. while D. but

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