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Children were seen _____ their hands and ___a song when I ca

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Children were seen _____ their hands and ___a song when I came into our classroom.
A clapped;sang
B clapping;singing
C clap;sing
D to clap;sing
B clapping;singing 为正确选项.
知识点延伸-----------
(1)句子有when .表示过去某个时间点的时间状语,故clap和sing都是那个时间正在发生的动作,用进行时态;
(2)see sb doing sth的被动语态是,sb be seen doing sth.
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