单选题：What accounts for the high drop-out rates for online student

题目分类：综合类
题目类型：单选题
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题目内容：

What accounts for the high drop-out rates for online students? A．There is no strict control over the academic standards of the courses.
B．The evaluation system used by online universities is inherently weak.
C．There is no mechanism to ensure that they make the required effort.
D．Lack of classroom interaction reduces the effectiveness of instruction.

参考答案：

答案解析：

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分类：综合类题型：单选题

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