Scientists are convinced_____the positive effect of laughter_____physical and me
题型:不详难度:来源:
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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答案
C |
解析
be convinced of确认,认识到;the effect on对……的影响。 |
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