【单选题】
Sometimes online distance learning can be a problem because ______.
A.learners can't afford it
B.learners get too many hints
C.it involves excessive writing
D.it is not available at the weekend
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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
18%的考友选择了B选项
50%的考友选择了C选项
27%的考友选择了D选项