关于一道英语选择题Another five weeks ___necessary for us to finish th

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关于一道英语选择题
Another five weeks ___necessary for us to finish the work.
A.are B.was Cis D.will have been为什么选C.

我们从中文的角度来回答这个问题为什么选C：
首先,先理解这句话的中文意思：“我们还需要五个星期才能够完成这项工作”
其次,在英语语法中,Be动词时用单数还是复数取决于主语,这句话的主语是“Another five weeks”,虽然我们说five weeks好像看起来就是复数,但是请注意,这里提到的Another five weeks是一个主体“另外的五个星期”所以,五个星期作为一个主体就是一个单数,由此可见,be动词应该选单数的be动词,所以可以排除A选项
再次,这句话的语态是现在时,意思是这项工作还没有完成,所以不应该用过去时,这样子就排除了B选项和D选项；
总之,这句话选择C是要看主语是单数并且是现在时,楼主弄清楚这两个概念就明白了.

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