（题文）Optimism has a positive effect ________ people's physical and mental health, ________ which I'm ...
2022-09-19 21:07:09 87次 吉林省2017-2018学高一下学期期末考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
（题文）Optimism has a positive effect ________ people's physical and mental health, ________ which I'm very convinced.
A. on; of B. to; in
C. at; at D. on; at
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