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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

高三英语单项填空简单题

少年,再来一题如何?
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