单项选择Look!There are a lot of children ____ on the playground.A.playing B.are playing
问题描述：
单项选择Look!There are a lot of children ____ on the playground.A.playing B.are playing
答
答案：A
解析：现在分词作后置定语,不能再用are playing,因为前面已经有谓语动词are了,所以后面就不能再用are了,否则句子中将会有两谓语动词,是错误的,应该用非谓语动词形式,即用现在分词作后置定语
翻译：看,操场上有许多孩子在玩.