If oil______on the frozen north coast in the 1960s an 800-mile pipeline would not have be
专四
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If oil______on the frozen north coast in the 1960s, an 800-mile pipeline would not have been constructed to bring it to the south coast.
A．was not discovered
B．was discovered
C．had not been discovered
D．had been discovered
请帮忙给出正确答案和分析，谢谢！
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正确答案：C
本题考查虚拟语气，是与过去事实相反(主句用了should／wouldhave+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。