I felt somewhat disappointed and was about to leave,___ something occurred attracted my attention.[A] unless [B] until [C] when [D] while为什么选C?请翻译句子

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I felt somewhat disappointed and was about to leave,___ something occurred attracted my attention.[A] unless [B] until [C] when [D] while为什么选C?请翻译句子
I felt somewhat disappointed and was about to leave,___ something occurred attracted my attention.
[A] unless [B] until [C] when [D] while
为什么选C?请翻译句子

I felt somewhat disappointed and was about to leave,___ something occurred attracted my attention.[A] unless [B] until [C] when [D] while为什么选C?请翻译句子
when表同时.
译:当我觉得失望,正要离开的时候,有东西出现了,吸引了我的注意力.

B
until something
直到

leave前的逗号是错误的吧