John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

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问题 John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

选项 A、while
B、when
C、until
D、unless

答案D

解析连接词辨析题。根据结构判断，空格前后的分句之间为并列关系，这两个分句表达的是几乎同时发生的时间关系，四个选项中只有when既可以表示并列关系，又可以表示时间关系；while虽然可以作并列连词，但是强调转折关系，表示“然而，却”，相当于whereas。

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专业英语四级

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