Traffic police have to make decisions______.A、on the spotB、on businessC、on pur

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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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Mary:Excusemeforbeinglate,Peter.Iwasheldupbythetraffic.Peter:___