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

分析 旅行时,你有时不得不独自去某个地方,这时你要总把注意力集中在你的财物上.

解答 答案:A
此处在句中作伴随状语,由于动词focus与其逻辑主语you构成的是主谓关系,故用现在分词形式;B.D分别为动词的第三人称单数形式以及动词原形,它们只能在句中作谓语;C.过去分词作状语时,与其逻辑主语构成的是动宾关系;故选A.

点评 本题考查了现在分词作伴随状语的用法;做本题时,首先需要根据句意,判断出空缺处在句中所作的成分,然后找出动词与其逻辑主语的关系(是被动与完成还是主动与进行),从而确定出相应的非谓语动词;另外,还应熟练掌握现在分词与过去分词的用法及区别.

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