A．The problem may have been a very complicated one.B．No-找考题网

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A．The problem may have been a very complicated one.
B．No one can do it.
C．The woman thinks that the problem is too easy.
D．The man can solve the problem himsel

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A．Three thousand years ago.B．When man began to salt fish.C．When man began to preserve the dead.D．No one knows.

A．Three thousand years ago.
B．When man began to salt fish.
C．When man began to preserve the dead.
D．No one knows.

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