9．When traveling，you sometimes have to go somewhere alone，always ____ your attention on your belongings．（　　）
A．focusingB．focusesC．focusedD．focus

分析 旅行時(shí)，你有時(shí)不得不獨(dú)自去某個(gè)地方，這時(shí)你要總把注意力集中在你的財(cái)物上．

解答 答案：A
此處在句中作伴隨狀語，由于動(dòng)詞focus與其邏輯主語you構(gòu)成的是主謂關(guān)系，故用現(xiàn)在分詞形式；B．D分別為動(dòng)詞的第三人稱單數(shù)形式以及動(dòng)詞原形，它們只能在句中作謂語；C．過去分詞作狀語時(shí)，與其邏輯主語構(gòu)成的是動(dòng)賓關(guān)系；故選A．

點(diǎn)評(píng) 本題考查了現(xiàn)在分詞作伴隨狀語的用法；做本題時(shí)，首先需要根據(jù)句意，判斷出空缺處在句中所作的成分，然后找出動(dòng)詞與其邏輯主語的關(guān)系（是被動(dòng)與完成還是主動(dòng)與進(jìn)行），從而確定出相應(yīng)的非謂語動(dòng)詞；另外，還應(yīng)熟練掌握現(xiàn)在分詞與過去分詞的用法及區(qū)別．

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