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Some new oilfields ________ since 1976.

A. were opened up B. will be opened up

C. have opened up D. have been opened up

D

【解析】

試題分析:句意:自從1976年,一些新的油田被開放了。A. were opened up 一般過去時的被動 B. will be opened up一般將來時的被動C. have opened up 現在完成時D. have been opened up現在完成時的被動。since 是現在完成時的標志詞,油田和開放是被動關系,故選D。

考點:考查動詞時態的用法。

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