【題目】—Great changes have taken place _____ we enter E-Times.
—Yeah. I agree with you.
A.since
B.as soon as
C.when
D.before

【答案】A
【解析】句意:—自從我們進入電子時代以來,發(fā)生了巨大變化!堑。我同意你(的觀點)。have taken place 是現(xiàn)在完成時,后面的時間狀語需要能和現(xiàn)在完成時連用; since“自從……以來”, 其引導的時間狀語常與完成時連用。所以答案是A。

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