A.Put your hand in the desk.

B.Put your hand on the desk.

C.Put your hand on the chair.

【答案】B

【解析】

祈使句一般由动词原形引导。在桌子上用on the desk。A. Put your hand in the desk. 把你的手放在桌子里；B. Put your hand on the desk. 把手放在桌子上；C. Put your hand on the chair. 把手放在椅子上。故选B。