—Howdidit　　　thatyoumadesuchasillymistake?—Imyselfhaven...

问题详情：

 —How did it　　　that you made such a silly mistake?

—I myself haven’t figured it out yet.

A. bring about                      B. come about

C. come across                  D. come on

【回答】

【解析】选B。考查句型How does/did it come about that. . . ?意为:  “……是怎么回事?” ; bring about导致, 引起; come across偶然碰到; come on加油。

知识点：动词

题型：选择题