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Scientists are convinced the positive effect of laughter physical and mental hea

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Scientists are convinced the positive effect of laughter physical and mental hea

Scientists are convinced ________ the positive effect of laughter ________ physical and mental health

[]

A．of; at

B．by; in

C．of; on

D．on; that

试题答案

答案：C

标签：effectpositivelaughterofare

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