问题
选择题
When he was asked suddenly about the matter ,he couldn’t_____an answer at once.
A．come up with
B．look for
C．put up with
D．answer for
答案
A
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”