题目内容：
More than 97% of the participants found the course to be useful and （） .
A.mysterious
B.practicable
C.destructive
D.neutral
参考答案：
选择题：More than 97% of the participants found the course to be use
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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