Scientistsareconvinced
来源:语文精选馆 1.79W
问题详情:
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
A. of;on B. by;in C. of;at D. on;at
【回答】
A
知识点:介词
题型:选择题
问题详情:
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
A. of;on B. by;in C. of;at D. on;at
【回答】
A
知识点:介词
题型:选择题