I felt somewhat sad and was about to leave something happened which drew My attention.A.

发布时间：2020-08-16 07:32:35

I felt somewhat sad and was about to leave      something happened which drew
My attention.    
A. unless
B. until
C. when
D. while

网友回答

A. unless
B. until
C. when
D. while
解析：C
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