问题
选择题
She has been practising _______ the same tune on the piano for nearly an hour. [ ]
A. play
B. playing
C. to play
D. be playing
答案
答案：B
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She has been practising _______ the same tune on the piano for nearly an hour. [ ]
A. play
B. playing
C. to play
D. be playing
答案：B