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Fred entered without knocking and, very out of breath, sank _______ a chair.
A、on
B、off
C、into
D、to
【正确答案】：C
【题目解析】：考查动词与介词的搭配。“sink into sth”意思是“渗入，陷入，沉入；投入......”等意思，“sink into a chair”意思是（一屁股）坐到椅子上”。其他搭配均不恰当。