【单选题】
I felt somewhat disappointed and was about to leave, ______ something occurred which attracted my attention.
A.unless
B.until
C.when
D.while
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根据网考网移动考试中心的统计,该试题:
6%的考友选择了A选项
33%的考友选择了B选项
54%的考友选择了C选项
7%的考友选择了D选项