There _______ a lot of _______ on the roads yesterday. A. was , traffic B. were ,traffics C. was ,traffics D. were ,traffic

There _______ a lot of _______ on the roads yesterday.
A. was , traffic
B. were ,traffics
C. was ,traffics
D. were ,traffic

出自：兰州大学大学英语（4）课程作业

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