---Why did the police______ the crowd?---Because the president’s car ______ in the street.A.break down; went wrongB.break up; out of orderC.break down; broke upD.break up; broke down
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D解析本题考查动词词组意思的辨析。break up使粉碎；弄破；解散；结束；解体解散；中断；终止; break down打破；发生故障；中止;句意为：为什么警察要疏散人群？因为总统的汽车在接受发生故障了。如果选择B，需要在out of order前面加was.