Tim was sad because his pet dog______.A.was died B.had been dead C.had died D.had been died
问题描述：
Tim was sad because his pet dog______.A.was died B.had been dead C.had died D.had been died
答
C
Tim很伤心,因为他的宠物狗死了.
had died表示在他伤心之前已经存在的状态.（过去完成时表示在一个动作/状态之前已存在的另一个动作/状态）.不可用被动式.