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I heard him ______ a song when I went into the room.

[    ]

　　A. sings   B. sang   C. singing   D. to sing

I heard him______ outside.

My best friend is good at ________.

A. sing              B. sings                        C. singing                D. sang

I often heard her            in the room.

A. sing           B. sang          C. singing         D. sings