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