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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