問題詳情:
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
知識點:介詞
題型:選擇題
問題詳情:
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
知識點:介詞
題型:選擇題