选A.
首先traffic是不可数名词.
其次一般的搭配是用heavy；指人就用heavy.
They couldn't arrive because they were delayed by?
They couldn't arrive because they were delayed by?
A.heavy traffic B.heavy traffics
C.crowded trafffic.D.crowded traffics.
选什么?为什么?根据语法规则是什么?
A.heavy traffic B.heavy traffics
C.crowded trafffic.D.crowded traffics.
选什么?为什么?根据语法规则是什么?
英语人气：853 ℃时间：2019-08-26 06:41:55
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