--Why did the police the crowd?---Because the president’s car in the street.A. break down;

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A. break down; broke down
B. break up; broke up
C. break down; broke up
(答案→)D. break up; broke down
解析：这题考查词组，第一空考查break up“驱散”，第二空考查break down“抛锚”，句意是：--为什么警察驱散人群？--因为总统的车路上抛锚了。选D。