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3道英语单选题,求详解,

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3道英语单选题,求详解,
1.Many of the human problems associated with living in the ocean are _____ the problems of living in other space.
A.just as B.such as C.such that D,the same as
为什么选D不选A?A和D选项有什么区别吗?
2.The material is elastic,_____shown in the figure.
A.which B.as C.that D.just as
3.As they usually receive the same score on atandardized examinations ,there is often disagreement as to ____ is the better student,Bob or Helen.
A.which B.who C.whom D.whose
为什么选B不选A
第二题选B。
英语专业大一新编英语语法教程里是有just as 的用法的。
3道英语单选题,求详解,
1、填空部分需要的意思是“和……一样”,而且词性是介词,而只有D符合,A是连词.
2、填空部分需要的意思是“正如”,这里是一个定语从句,as指代前面的句子,而且是固定用法,比如as is known to us----正如我们所知.
3、填空部分需要一个词,做as to引导的宾语从句的主语部分,不是定语从句所以不能用which,而所需要词指代的bob or helen相当于该从句的主语,所以用who.
希望对你有所帮助.