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

解析試題分析：句意：Lucy以前真的很安靜，但是現在她很外向。是的，她改變了很多。短語used to do/be過去常常做/是……,動詞和be都要用原形，故選C。
考點：考查固定短語。