【題目】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:改革開放已經(jīng)四十年了。我國發(fā)生了巨大的變化。

考查介詞辨析。A. since自從……;是現(xiàn)在完成時的標志詞;B. before在……之前;C. after在……之后。分析句子可知,使用的是現(xiàn)在完成時,而since是現(xiàn)在完成時的標志詞。故選A。

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