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We can hardly believe that you learn to dance so ______.

A.quick4 M: h. c U/ M T4 ? B.quickly. K+ H2 @% b( _( C* S3 S5 i C.useful
1 C8 J% C W) F* i
D.usefully9 L% K' a& R: S6 c/ E/ [

答案B

解析