用所给词适当形式填空.Listen!Someone _____ (sing) in the next room.

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用所给词适当形式填空.Listen!Someone _____ (sing) in the next room.
用所给词适当形式填空.Listen!Someone _____ (sing) in the next room.

用所给词适当形式填空.Listen!Someone _____ (sing) in the next room.
is singing