Youcannottakebackyourwordsthey

You cannot take back your words ______ they are out of your mouth.

A．before

B．whether

C．once

D．while

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A．to serve

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A．wait

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— Sorry , you ____ .

A．May ; mayn''t

B．May ; can''t

C．Must ; mustn''t

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A．needn''t have come to

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