摘要：6．-I'll never understand how it that he still insisted on going there alone after being told about the possible danger. -Don't worry.He just likes taking adventure. A．came about B．came across C．came out D．came up 答案与解析:A it为understand引导宾语从句中的形式主语.真正的主语是后面的that从句.come about“发生 .how it came about that...“怎么会-- .

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