1.When I passed the next room,I heard someone_____.But befor

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1.When I passed the next room,I heard someone_____.But before that I had never heard anyone____
A.sing;sing B.singing;to sing C.singsing;sing D.sing;sing
I often hear the sound of children ____(play)in the park nearby

c听到某人正在做某事,ING形式,后一个是现在时hear sb do sth.
原型,因为是经常听到,所以是hear sb do sth.

1.When I passed the next room,I heard someone_____.But befor 四选一 When I passed the next room,I heard someone_____Japanese i heard someone___(cry)in the next room when i passed by 什么理 When l passed the next room,l heard someone --- Chinese in i I heard him ____ (sing) when I passed his room I heard her ＿（sing） in the next room when I came back. I heard them giggle when I passed by the girls. 1、When I passed his room,I heard him （）（sing）2、I always can& 1、When I passed his room,I heard him （）（sing） I heard him ____ (sing) when I passed his room填什么、、、、 I heard her in her room when I passed by. Ato sing I heard a strange sound when I p____his room.这里用pass还是passed