题目

解不等式组 . 答案：解： {−2x+1<x+4①x2−x−13≤1② ， 解不等式①，得x＞﹣1， 解不等式②，得x≤4， ∴原不等式组的解集为：﹣1＜x≤4He seemed ________ his job already.　[    ] A. to finish　　　B. finished C. finishing　　　D. to have finished