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Ifeltsomewhatdisappointedandwasabouttoleave,somethingoccurredattractedmyattention.[A]unless[B]until[C]when[D]while为什么选C?请翻译句子

题目详情
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
▼优质解答
答案和解析
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.