问题
选择题
---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
答案：C
题目分析：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。