问题
                    
She_______ thirty minutes_______ the piano every day.
                            A:spends; to practise playing
B:spends; practising playing
C:spend; practising to play
D:spend; practise play;
                        
                        B:spends; practising playing
C:spend; practising to play
D:spend; practise play;
正确答案是:
                        