题目内容
?Do you often hear John ________ in his room?
?Listen! Now we can hear him ________ in his room.
A. sing, to sing
B. singing, singing
C. sing, singing
D. to sing, singing
答案：C
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题目内容
?Do you often hear John ________ in his room?
?Listen! Now we can hear him ________ in his room.
A. sing, to sing
B. singing, singing
C. sing, singing
D. to sing, singing