题目内容
Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.
A. of; at B. by; in
C. of; on D. on; at
C
【解析】
试题分析:考查介词短语。句意:现在人们确信二手烟对周围人的副作用。be convinced of确信;effect影响,作名词,后跟介词on。故C正确。
考点:考查介词短语
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