问题补充：
How did all these ?
A. come out
B. come up
C. come across
D. come about
答案：
A. come out
B. come up
C. come across
(答案→)D. come about
解析：“这些是怎么发生的？”A. come out出来B. come up走上前来C. come across偶遇D. come about发生，答案D。
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