look at the children ( )tennis in the park A.play B.to play C.playing D.plays

问题描述:

look at the children ( )tennis in the park A.play B.to play C.playing D.plays
我知道答案是C 但C没加be动词 为什么要选它?

playing tennis in the park 是现在分词短语作后置定语,修饰children,意为:看那些在公园打网球的孩子.
等于:look at the children 【who are playing】tennis in the park