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來源：網絡資源 2009-09-27 15:41:01
現在完成時專項練習
一、 單項選擇。
1、Both his parents look sad . Maybe they _________what's happened to him .（呼和浩特）
Ａ. knew Ｂ. have known Ｃ. must know Ｄ.will know
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