问题
选择题
—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
答案
答案：B
题目分析：句意为：--你做出这么愚蠢的决定，怎么会发生这种事儿呢？--我自己也弄不明白（怎么会发生这种事情）。bring about 引起，使掉头；come about产生，发生；come across（偶然）遇到，碰到；come on加油，快点，开始。故答案为B