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my book has disappeared.who______have taken it?为什么填could,不填would?

题目详情
my book has disappeared.who______have taken it?
为什么填could,不填would?
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答案和解析
根据 my book has disappeared,
选 could ,说明书很可能拿走.
而would,说明书还在这儿.而不是 has disappeared