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 句意:我感到有些失望,正要离开时,发生了一件事,吸引了我的注意力。连词when在这里表示“这时”,相当于at that time。unless表示“除非”,与句意不符。while相当于during the time that,表示主句的动作是在从句动作进行期间发生,在这里也不符。until表示“直到”,与句意不合。
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