一道英语虚拟语气的题－－for the reservior(蓄水池),we’d never have been beat

一道英语虚拟语气的题
－－for the reservior(蓄水池),we'd never have been beat the drought.
A.were it not B it was not C had it not D it had not been
我可以派出答案B和D.把C选项改为 had it not been就对了.但是我不明白为什么选A.这是和什么时态相反的虚拟语气啊?we'd never have been 不是和过去实事相反吗?那为什么选A?

与过去事实相反了be动词应该用were,没有错啊,选A
(be用were而不用was)
would(第一人称可用
should)+动词原形
与过去事实相反 had+-ED分词 would(第一人称可用
should)+have+ -ED分词
与将来事实相反 were to+动词原形 would(第一人称可用
should)+动词原形
与将来事实可能相反 should+动词原形 would(第一人称可用
should)+动词原形

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