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【题目】It has been forty years ________ the reform and opening-up. Great changes have taken place in our country.

A.sinceB.beforeC.after

【答案】A

【解析】

句意:改革开放已经四十年了。我国发生了巨大的变化。

考查介词辨析。A. since自从……;是现在完成时的标志词;B. before在……之前;C. after在……之后。分析句子可知,使用的是现在完成时,而since是现在完成时的标志词。故选A

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