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Now the students each____an English-Chinese dictionary.

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Now the students each____an English-Chinese dictionary.
A.has
B.have
C.is having
D.are having
答案上选的是B,为什么呢?
The students each______an English dictionary
A.has B.will have c have had D have
怎么选A呢?
这两道题有什么语法上的不同?
都是each 在句子中所做成分不也一样吗?
each作为形容词,修饰单数名词,接单数动词.作为代词,单独使用,接单数动词;放在复数名词和代词后作同位语,接复数动词.each of them后可接单数或复数动词.如:
Each man carries his own bag.(修饰单数名词)各人背自己的包.
We each have our own office.(作We的同位语)我们各有各的办公室.
Each carries his own bag.(代词)各人背自己的包.
Each of them are/is here.(代词)他们每个人都在这儿.
我觉得这题就是考时态
第一个NOW.所以选B
第二个选C
表示现在完成时.