When he was asked suddenly about the matter he couldn’tan answer at once.A. come up withB

问题补充：

When he was asked suddenly about the matter ,he couldn’tan answer at once.

A. come up with

B. look for

C. put up with

D. answer for

答案：

A. come up with

B. look for

C. put up with

D. answer for

解析：题意：当他突然被问及那事时，他不能立刻得出答案。come up with“得出答案” look for“寻找” put up with“提出” answer for“负责”