--Do you often hear John in his room? --Yes. Listen! Now we can hear him in his room.A.

--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

A. sing; to singB. singing; singing(答案→)C. sing; singingD. to sing; singing解析：可联系答.案.网客服索取。

这个解释是对的