问题描述：
--Did you hear her singing this pop song this time the other day?--Yes,and I heard this song.
--Did you hear her （singing） this pop song this time the other day?
--Yes,and I heard this song （sung） in English.
为什么填 singing；sung?
--Did you hear her （singing） this pop song this time the other day?
--Yes,and I heard this song （sung） in English.
为什么填 singing；sung?
问题解答：
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