20、Asked suddenly about the matter, he couldn’t        an answer at once.

A．come up with                 B．look for 

C．put up with                    D．a(chǎn)nswer for

20、A

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Asked suddenly about the matter, he couldn’t        an answer at once.

A．come up with                 B．look for 

C．put up with                    D．a(chǎn)nswer for

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