At that time there were a groupof birds ________ in the sky Afly B to fly C flying D flew选哪个
问题描述：
At that time there were a groupof birds ________ in the sky Afly B to fly C flying D flew
选哪个
答
At that time there were a group of birds ____flying____ in the sky.
Afly B to fly C flying D flew
因为描述的是鸟群在天空飞的景象，所以用进行时。
句子中文意思：那时，天空中有一群鸟在飞翔。
答
At that time there were a group of birds ________ in the sky Afly B to fly C flying D flew
答案：C
解释：动词ing形式表示正在进行，主动。
句意：在那个时候，天空中有一群鸟正在飞翔。
祝你学习进步，更上一层楼！(*^__^*)
有不会的可以再问我:）
答
c
现在分词作定语,表示主动和进行
答
C