Question

---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

Answer 1

C

解析试题分析：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。
考点：考查固定短语。