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求解释一道英语单选题my new issue of china daily has disappeared.who___

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求解释一道英语单选题
my new issue of china daily has disappeared.who___have taken it?Acould Bmust Cshould Dwould答案是A但是我不懂为什么
求解释一道英语单选题my new issue of china daily has disappeared.who___
my new issue of china daily has disappeared.who___have taken it?Acould Bmust Cshould Dwould答案是A但是我不懂为什么
因为who引导的问句是一个【过去虚拟时态】,只能用【could/ should】+ have done
在虚拟语气中,should表【应该】的意思,而could在一般陈述句中表【能够】,在疑问句中表【可能】的意思
再问: 可是也有must have done would have done这些啊,为何不能选?
再答: 每个情态动词都有着它们各自的词义。could have done表示对过去情况的推断,意思是:可能已经做了;should have done表示本来应该做而没有做;must have done表示过去一定做了,对过去情况的断定;would have done表示对过去事情的假设,意思是“本来会做”。