问题
选择题
My mother heard her ________ the piano in the next room at 10:00 last night. [ ]
A. played
B. to play
C. playing
D. plays
答案
答案：C
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My mother heard her ________ the piano in the next room at 10:00 last night. [ ]
A. played
B. to play
C. playing
D. plays
答案：C