The traffic was when the car accident happened .A. held upB. held outC. held onD. held do

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(答案→)A. held up
B. held out
C. held on
D. held down
解析：考查短语辨析。held up阻塞，held out伸出，held on继续，held down阻止，句意：当车祸发生的时候交通被阻塞了。故选A。