【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】考查連詞。句意：盡管網(wǎng)上購物已經(jīng)改變了我們的生活，但是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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