Begoodat和Dowellin的区别.一道选择题：-I____singingwhenIwasastudent.Whataboutyou,Rose?-Icouldn'tsingatall,butI____dancingandplayingthepiano.A.amgoodin;dowellatB.dowellin;amgoodatC.wasgoodat;didwellinD.d

　　Begoodat和Dowellin的区别.

　　一道选择题：

　　-I____singingwhenIwasastudent.Whataboutyou,Rose?

　　-Icouldn'tsingatall,butI____dancingandplayingthepiano.

　　A.amgoodin;dowellat

　　B.dowellin;amgoodat

　　C.wasgoodat;didwellin

　　D.didwellat;wasgoodin

　　要解释下、、