—How did it that you made such a silly mistake?—I myself haven’t figured it out yet.A. b

—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

A. bring about(答案→)B. come aboutC. come acrossD. come on解析：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

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