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3. Who would have thought?

Who would have thought?

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Who would have thought?

 and Who could have thought?

a question phrase indicating surprise or amazement; I would never have guessed that something so surprising could happen. (No answer is expected.) Tom: Fred just quit his job and went to Africa. Bill: Who would have thought he could do such a thing? Andy: They say Bill is training for the Olympics in his spare time. Rachel: Who would have thought?

See also: have, who