I felt somewhat disappointed and was about to leave,_______ something occurred which attracted my attention. ( 章节：1 难度：3)_做题室

单项选择题I felt somewhat disappointed and was about to leave,_______ something occurred which attracted my attention. ( 章节：1 难度：3): A、unless; B、until; C、when; D、while

正确答案：C
答案解析：
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