------Do you often hear John ___in his room?----Listen,now we can hear him ____in his room .%Dª singing,singingB sing,singingC to sing,singing

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------Do you often hear John ___in his room?----Listen,now we can hear him ____in his room .%Dª singing,singingB sing,singingC to sing,singing

答案:Bhear sb do sth hear sb doing sth记得采纳,