问题补充:
---Lucy really quiet but now she is very outgoing.
---Yes. She has changed a lot.
A. use to be
B. used to
C. used to be
D. be used to be
答案:
A. use to be
B. used to
(答案→)C. used to be
D. be used to be
解析:句意:Lucy以前真的很安静,但是现在她很外向。是的,她改变了很多。短语used to do/be过去常常做/是……,动词和be都要用原形,故选C。