She spent half an hour piaying the piano改成保持句意不变
问题描述：
She spent half an hour piaying the piano改成保持句意不变
答
1.It took her half an hour to play the piano.2.She spent half an hour on the piano.3.What took her half an hour was playing the piano.4.Playing the piano costed her half an hour.5.She was playing the ...