When Lily worked as a nurse in the hospital, she experienced a joy in helping people ________ troubl...
2022-10-21 12:10:16 196次 2015-2016学年北京东城高一上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
When Lily worked as a nurse in the hospital, she experienced a joy in helping people ________ trouble.
A. on B. in C. at D. of
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