【单选题】
John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.
A.while
B.when
C.until
D.unless
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根据网考网移动考试中心的统计,该试题:
5%的考友选择了A选项
17%的考友选择了B选项
1%的考友选择了C选项
77%的考友选择了D选项