This song is heard____now.A singing B to sing C sang D sung 选哪个?为什么?

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Thissongisheard____now.AsingingBtosingCsangDsung选哪个?为什么?Thissongisheard____now.AsingingBtosingCsangD

This song is heard____now.A singing B to sing C sang D sung 选哪个?为什么?
This song is heard____now.A singing B to sing C sang D sung 选哪个?为什么?

This song is heard____now.A singing B to sing C sang D sung 选哪个?为什么?
选A,singing
后面有个now,所以跟doing,表示,动作正在进行