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-Do you often hear John ________ in his room?
-Yes.Listen! Now we can hear him ________ in his room.
A.sing; to sing
B.singing; singing
C.sing; singing
D.to sing; singing
---Do you often hear John _______ his room?
---Yes. Listen! Now we can hear him _______ in his room.
A. sing, to sing B. singing, sing C. sing, singingD. to sing, singing