2.Listen!Someone ____ in the next room.A.sing B.singing C.is singing D.are singing

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2.Listen!Someone ____ in the next room.A.sing B.singing C.is singing D.are singing
2.Listen!Someone ____ in the next room.A.sing B.singing C.is singing D.are singing

2.Listen!Someone ____ in the next room.A.sing B.singing C.is singing D.are singing
选C