There were many birds_____the sky.A.fly B.flew C.flying .用合适的动词填空理由

问题描述:

There were many birds_____the sky.A.fly B.flew C.flying .用合适的动词填空理由

选C 句子中已有谓语,所以不可能用A,鸟是飞的主语,所以选C