It is said that two cows ______ by a tiger from the nearby mountains.A.have been killed B.to be killed C.being killed D.had been killed请问怎样选择,为什么?

It is said that two cows ______ by a tiger from the nearby mountains.A.have been killed B.to be killed C.being killed D.had been killed请问怎样选择,为什么?
It is said that two cows ______ by a tiger from the nearby mountains.
A.have been killed B.to be killed C.being killed D.had been killed
请问怎样选择,为什么?

It is said that two cows ______ by a tiger from the nearby mountains.A.have been killed B.to be killed C.being killed D.had been killed请问怎样选择,为什么?
A
首先,It is said that 后面跟从句,那么two cows ______ by a tiger from the nearby mountains
这一块应该是一个完整的句子,而这句话很显然缺谓语,那么B、C都不能成为谓语.而A和D两种形式是时态的问题,由于主句It is said that 是现在时态,从句应该用现在完成时态.如果从句用的was的话就应该选D了.也就是说主句是过去时,从句的动作发生在过去的过去,用过去完成时.

A ，这句话的意思是：据说有两头奶牛被附近山上的一只老虎杀害了。整个句子是It is said that+陈述句的结构，所以排除B不定式结构和C现在分词结构，由于时态是一般现在时，属于现在时间段，所以应该选择A现在进行时，表示过去发生的事情对现在产生影响。...

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A ，这句话的意思是：据说有两头奶牛被附近山上的一只老虎杀害了。整个句子是It is said that+陈述句的结构，所以排除B不定式结构和C现在分词结构，由于时态是一般现在时，属于现在时间段，所以应该选择A现在进行时，表示过去发生的事情对现在产生影响。

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D，主句是过去时，从句也要用过去时，上面四个选项只有D是过去完成时，因此选D。

我也选D

D ，发生在过去的过去，用过去完成时。