If oil______on the frozen north coast in the 1960’s, an 800-mile pipeline would

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问题 If oil______on the frozen north coast in the 1960’s, an 800-mile pipeline would not have been constructed to bring it to the south coast.

选项 A、was not discovered
B、was discovered
C、had not been discovered
D、had been discovered

答案 C

解析本题考查虚拟语气，是与过去事实相反(主句用了should／would have+过去分词)，从句要用过去完成时。题意为，如果在20世纪的60年代没有在北部冰封的海岸发现石油，把它运到南部海岸的800英里的输油管本来是没有必要修建的。

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Ifoil______onthefrozennorthcoastinthe1960’s,an800-milepipelinewould