19．withher attention fixed on her book，she didn't notice her enter the room．

分析 她專注看書，沒有注意到她進屋．

解答 答案：with
分析句式可知，前半句是with一個復(fù)合結(jié)構(gòu)，表示伴隨狀況，即with+名詞+過去分詞．

點評 考生須掌握with復(fù)合結(jié)構(gòu)的用法．

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