He told his friends that he was going to Japan______.A、on dutyB、on businessC、o

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问题 He told his friends that he was going to Japan______.

选项 A、on duty
B、on business
C、on board
D、on the spot

答案 B

解析 本题考查介词短语。A“上班,值班”;B“(因公)出差”;C“在船(火车、飞机、汽车)上;已装船”;D“当场;在危险中;处于负责地位”。根据句意,故选B。
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