—Ittakesmehalfanhour

問題詳情：

—It takes me half an hour _____playing the piano. How about you?

   —I usually spend 20 minutes ____it.

A. practicing ; on    B. to practice ; in    C. to practice ; on

【回答】

C

知識點：動詞和動詞短語

題型：選擇題