I’m surprised to see you are a chain smoker. You I remember.A. didn’t use to be B. must

问题补充：

I’m surprised to see you are a chain smoker. You , I remember.

A. didn’t use to be

B. mustn’t

C. used not to

D. didn’t have to

答案：

(答案→)A. didn’t use to be

B. mustn’t

C. used not to

D. didn’t have to

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