How do you know that she likes singing?I often hearher___(sing)after class.适当形式填空,

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How do you know that she likes singing?I often hearher___(sing)after class.适当形式填空,
How do you know that she likes singing?I often hear
her___(sing)after class.适当形式填空,

How do you know that she likes singing?I often hearher___(sing)after class.适当形式填空,
sing
经常听到某人做某事或做过某事hear sb do sth
表示经常性的一个状态,完整的
hear do 听到经常...
hear doing 听到正在..