Scientists are convinced ___________the positive effect of laughter_________ phy - 高中英语试题 - 超级试练试题库

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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

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试题【Scientists are convinced ___________the positive effect of laughter_________ phy】；主要考察你对介词和介词短语等知识点的理解。[详细]

举一反三

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