题干


49. He goes _____ at 8 a.m. and comes _____ at 5 p.m. Today he is _____.

A:on duty; off duty; on night duty

B:on his duty; off the duty; on night duty

C:to duty; from duty; at night duty

D:in duty; out duty; at night duty

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答案(点此获取答案解析)

A