Listen!Can you hear birds（）in the tree?A.sing B.to sing C.sings D.singing

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Listen!Can you hear birds（）in the tree?A.sing B.to sing C.sings D.singing
Listen!Can you hear birds（）in the tree?A.sing B.to sing C.sings D.singing

Listen!Can you hear birds（）in the tree?A.sing B.to sing C.sings D.singing
D.singing

Listen!Can you hear birds（ ）in the tree?A.sing B.to sing C.sings D.singing