At that time there were a groupof birds ________ in the sky Afly B to fly C flying D flew

At that time there were a groupof birds ________ in the sky Afly B to fly C flying D flew
选哪个
英语人气:493 ℃时间:2019-08-20 17:58:53
优质解答
c
现在分词作定语,表示主动和进行
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