The pair of shoes   （）     worn out.

题目解析 题目：The pair of shoes () worn out. A. had been B. have been C. were D. was 答案：D 解析：这道题考察的是主谓一致。"The pair of shoes" 是单数形式，所以谓语动词也应该用单数形式。正确的答案是 "was"，表示 "The pair of shoes was worn out."（这双鞋已经磨损了）。