瑞星卡卡安全论坛综合娱乐区Rising茶馆 一道选择题!急啊!!!!!!

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一道选择题!急啊!!!!!!

晕,我看一阵子头都大了,不过我哥说是D。
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有点晕``
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选A ,focused(adj.) on… 做stay的表语
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引用:
【vineday的贴子】选A ,focused(adj.) on… 做stay的表语
………………

这么说还有道理,看来是我以前的判断错了。就是说:focused 和alert是并列关系。
Being fit helps you to stay alert and focused on your lessons
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引用:
【fightout的贴子】None of them is right. Obviously, the proper answer should be "focus on"(a bare infinitive)
The structure is just as follows:
help sb to do A and do B
………………


I agree!
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D 因为and是表并列,而前边有一个helps.
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