49. He goes at 8 a.m. and comes at 5 p.m. Today he is .A. on duty; off duty; on night du

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

(答案→)A. on duty; off duty; on night dutyB. on his duty; off the duty; on night dutyC. to duty; from duty; at night dutyD. in duty; out duty; at night duty解析：可联系答.案.网客服索取。

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