【題目】As we all know, great changes _______ in China in the past thirty years.

A. took place B. have taken place

C. happened D. have happened

【答案】B

【解析】句意：正如我們所知道的，在剛剛過去的三十年里巨大的變化發(fā)生了。此題考查一般過去時。根據(jù)句意，應選A。

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