—What's up? You didn't pick up the phone just now.—I'm sorry that I dancing with music on

问题补充：

—Whats up? You didn pick up the phone just now.

—Im sorry that I dancing with music on, but its done now.

A. practised

B. was practising

C. am practising

D. have practiced

答案：

A. practised

(答案→)B. was practising

C. am practising

D. have practiced

解析：B 考察时态。句义：—怎么回事？你刚才没有接电话。—对不起，我刚才正在随着音乐练习舞蹈，现在不是接了电话吗？由句义可知，选过去进行时。