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(shí)的被動 B. will be opened up一般將來時(shí)的被動C. have opened up 現(xiàn)在完成時(shí)D. have been opened up現(xiàn)在完成時(shí)的被動。since 是現(xiàn)在完成時(shí)的標(biāo)志詞，油田和開放是被動關(guān)系，故選D。

考點(diǎn)：考查動詞時(shí)態(tài)的用法。

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