Traffic police have to make decisions______.

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问题 Traffic police have to make decisions______.

选项 A、on the spot
B、on business
C、on purpose
D、on the watch

答案A

解析 本题考查on相关的词组辨析。on the spot,在现场;on business,出差;on purpose,故意地;on the watch,密切注意。从本题句意来看,应该是说交通警察必须当场做决定,所以选A。
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