问题
选择题
Liu Fang ______ pipa since she was six years old. [ ]
A. played
B. was playing
C. had been playing
D. has been playing
答案
答案：D
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Liu Fang ______ pipa since she was six years old. [ ]
A. played
B. was playing
C. had been playing
D. has been playing
答案：D