I felt somewhat disappointed and was about to leave, ___ something occurred attracted my attention. [ A、 ] unless [ B、 ] while C、 ] when [ D、 ] until [

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

A、 ] unless [

B、 ] while

C、 ] when [

D、 ] until [

出自：阿坝师范学院大学英语

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