c
現(xiàn)在分詞作定語,表示主動和進行
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
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英語人氣：102 ℃時間：2019-08-20 17:58:53
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