It is obvious to the studentsthey should get well prepared for their future.A,as b,whichC,

发布时间:2020-08-17 02:22:45

It is obvious to the students    they should get well prepared for their future.
A,as      b,which    C,whether      D,that

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解析:通过分析句子结构,可知句子的真正主语是后面的主语从句,it是形式主语,且引导词在主语从句中没有作任何成分,且没有任何实际意义,故用that。
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