题目内容：
Lei Feng is always ready to help others when they are in trouble and he never _______ their request. A. turns up
B. turns over
C. turns in
D. turns down
参考答案：
选择题：Lei Feng is always ready to help others when they
- 题目分类： Lei Feng is always ready
- 题目类型：选择题
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A. turns up
B. turns over
C. turns in
D. turns down