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【题目】 _______online shopping has changed our life , not all of its effects have been positive.

A. Since B. After

C. While D. Unless

【答案】C

【解析】

试题分析:句意:尽管网上购物已经改变了我们的生活,单数不是所有的影响都是积极的。While引导让步状语从句,意为“尽管,虽然”;since既然,自从;after在……之后;unless除非。故选C。

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