He told him friends that he was going to Japan _____.
A. on duty
B. on business
C. on board
D. on the spot
A. on duty
B. on business
C. on board
D. on the spot
【答案】
A. on duty
B. on business
C. on board
D. on the spot
A. on duty
B. on business
C. on board
D. on the spot
【答案】
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