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  3. I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.

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问题 I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.
选项 A、unless
B、until
C、when
D、while
答案C
解析 本题考查连词的用法。when作并列连词，表示当某事正在进行时，另一事件突然发生，相当于atthet time。while多用于延续性动作，但此句的主句与从句相关的动作分别为leave与occur，均为短暂性动作，因此不用while。
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