I don’t play basketball any more, _________ when I was a child.　
(A) but I used to
(B) I used to
(C) but I used to do
(D) I used to do

I don’t play basketball any more, _________ when I was a child.　 (A) but I used to (B) I used to (C) but I used to do (D) I used to do [参考答案：A]