Withhisattention 國語站 題庫 5.75K 大中小設定文字大小 問題詳情:With his attention ________ on his book, he didn't notice someone entering his room.A. concentrating B. concentrated C. to concentrate D. concentrates【回答】B知識點:非謂語動詞題型:選擇題 TAG標籤:Withhisattention #