My English -Chinese dictionary has disappeared.Who __have taken it?A should B must C could D would哪位老师可以告诉一下为什么选could 而不能选would

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My English -Chinese dictionary has disappeared.Who __have taken it?A should B must C could D would哪位老师可以告诉一下为什么选could 而不能选would
My English -Chinese dictionary has disappeared.Who __have taken it?A should B must C could D would
哪位老师可以告诉一下为什么选could 而不能选would

My English -Chinese dictionary has disappeared.Who __have taken it?A should B must C could D would哪位老师可以告诉一下为什么选could 而不能选would
首先是语法的问题:
那个问句用了过去【虚拟】时态,只能用【could/should】+ have done
其次是语义的问题:
在虚拟时态当中,should表【应该】的意思,而could在一般句中表【能够】,在疑问句中表【可能】的意思