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题型:单选题 题类:常考题 难易度:普通

牛津译林版2017-2018学年高一英语模块2 Unit 1 Tales of the unexplained 同步练习

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.
A、of; at B、by; in C、of; on D、on; at
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