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【单选题】
车辆限行带来了新的商业机会，这是源于？A.
经济变化
B.
社会变化
C.
技术进步
D.
政策和管理制度变化
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
real objects
B.
word formation
C.
synomyms and antonyms
D.
mime
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