问题补充：
—Hi, Jack!
—Hi, Eric! You really quiet, but now you are very outgoing.
A. used to
B. use to
C. used to be
D. use to be
答案：
A. used to
B. use to
(答案→)C. used to be
D. use to be
解析：根据句意：你过去常常是很文静的，但是现在你很外向了。故选C.
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