问题描述: It is great fun ___(play)the piano . 1个回答 分类:英语 2014-12-05 问题解答: 我来补答 It is a great fun (to play) the piano.弹钢琴是一大乐趣.to play the piano是动词不定式作主语,it是形式主语. 展开全文阅读