问题
选择题
Though I have often heard this song ______, I have never heard you ______ it. [ ]
A. being sung; sang
B. sang; singing
C. sung; sing
D. to be sung; to sing
答案
答案：C
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Though I have often heard this song ______, I have never heard you ______ it. [ ]
A. being sung; sang
B. sang; singing
C. sung; sing
D. to be sung; to sing
答案：C