I usually get home late because there is traffic on the road.　　A. few B. many C. a lot D.

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A. few
B. many
C. a lot
(答案→)D. much
解析：考查名词的数。traffic“交通”，不可数名词，A、B修饰可数名词，排除A、B；a lot修饰动词或形容词副词，a lot of修饰名词，排除C；much修饰不可数名词，故用much。故选D。