用正确形式填空________ are they _________(sing) the song this moment.In the empty room.

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用正确形式填空________ are they _________(sing) the song this moment.In the empty room.
用正确形式填空________ are they _________(sing) the song this moment.In the empty room.

用正确形式填空________ are they _________(sing) the song this moment.In the empty room.
Where……singing

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