Speaker A: Did she really use to be very thin? Speaker B: ______A.How do you know that?B.Y

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Speaker A: Did she really use to be very thin? Speaker B: ______

A.How do you know that?

B.Yes, she did, but she isn"t any more.

C.I can"t believe what you"ve said.

D.I"m afraid that you are totally wrong.

请帮忙给出正确答案和分析,谢谢!

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