-Lucy really quiet but now she is very outgoing. ---Yes. She has changed a lot.A. use

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。