【单选题】
Not until some students failed the exam__________ how much time they had wasted.
A.they realized
B.did they realize
C.didn't they realize
D.they didn't realize
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根据网考网移动考试中心的统计,该试题:
11%的考友选择了A选项
85%的考友选择了B选项
0%的考友选择了C选项
4%的考友选择了D选项