49.Hegoesat8a.m.andcomesat5p.m

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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