问题
选择题
He spends half an hour ______ the piano. [ ]
A. to practise playing
B. practising playing
C. practising to play
D. to practise to play
答案
答案：B
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He spends half an hour ______ the piano. [ ]
A. to practise playing
B. practising playing
C. practising to play
D. to practise to play
答案：B