【題目】 _______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】

試題分析：句意：盡管網(wǎng)上購物已經(jīng)改變了我們的生活，單數(shù)不是所有的影響都是積極的。While引導讓步狀語從句，意為“盡管，雖然”；since既然，自從；after在……之后；unless除非。故選C。

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