When the woman came back home, she had no idea how it that her husband met with trouble a

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(答案→)A. came about
B. came out
C. came up
D. came across
解析：e about“发生”常与how连用，题中it是形式主语，后面的that从句是真正的主语。另外，e out出现、出版、(消息)传开、冲洗、罢工、(颜色或污点)被洗去、结果是(right/wrong)；e up走过来、出现、发生、被提出、(彩票)中奖、(太阳)升起；e across偶然遇见、无意中发现。