Question

【题目】--- You play the piano so well. How long have you learned it?

--- ten years.

A. In B. By C. For D. Since

Answer 1

【答案】C

【解析】句意：你弹钢琴弹得这么好。你学了多长时间了？----十年。for+时间段：表示做某事做了多长时间；结合句意和语境可知选C。