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 health.
A．of; at B．by; in C．of; on D．on; at
试题答案
C
C I convinced him of her honesty.或 I convinced him that she was honesty. onvince用作及物动词，意思是“使确信,使信服;说服 ”，有两种用法：convince sb .of sth.和convince sb . that …