题目内容：
Mary is always ready to help others when they are in trouble and she never ____ their requests.
A)
turns up
B)
turns over
C)
turns in
D)
turns down
参考答案：
选择题：Mary is always ready to help others when they are
- 题目分类：华北水利水电大学-水利水电工程-大学英语（3）
- 题目类型：选择题
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Mary is always ready to help others when they are in trouble and she never ____ their requests.
A)
turns up
B)
turns over
C)
turns in
D)
turns down