-- Who do you think _____ such a foolish thing?-- It _____ Tom, but I’m not sure

题干

-- Who do you think _____ such a foolish thing?
-- It _____ Tom, but I’m not sure.

A．could have done; may have been	B．could have done; must have been
C．should have done; may be	D．must have done; might have been

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