问题描述：
-Haven't you completed the building to be used as a library? -Yes.We_____ on it for over ten months. A.worked B.have worked C.are working D.will have worked 我有些搞不太清楚的是不是“for over ten months" 应该用 “have " 吧？
问题解答：
我来补答展开全文阅读