we often hear her _______(sing) English songs in the next room.主要要原因,

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we often hear her _______(sing) English songs in the next room.主要要原因,
we often hear her _______(sing) English songs in the next room.
主要要原因,

we often hear her _______(sing) English songs in the next room.主要要原因,
sing
hear doing sth

singing

是 singsing

应该填singing ,hear somebody doing ,所以后面填动词的ing 形式

singing .
hear doing 固定用法