“you and jack used to be unfriendly with each other ,is it true?反义疑问A.so we were B.so we di“you and jack used to be unfriendly with each other ,is it true?”“（ ）.but it is different now"A.so we were B.so we did为何选B不选A
问题描述：
“you and jack used to be unfriendly with each other ,is it true?反义疑问A.so we were B.so we di
“you and jack used to be unfriendly with each other ,is it true?”“（ ）.but it is different now"A.so we were B.so we did
为何选B不选A
答
是针对used的
答
谓语是uesd，是个动词，所以答案应该选B，用did来代表
答
used to 过去常常,在这里作动词、句子的谓语
所以选B
如果要选A,应该问：
You and jack were unfriendly with each other ,is it true?
So we were,but it is different now.
You and jack (used to be) unfriendly with each other?
So we did.(对应used to be)