Mr.white works as a journalist at present,but he ___in a high school for several yearsA.has worked B.worked C,had worked D.has been working 请详细说明为什么

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Mr.white works as a journalist at present,but he ___in a high school for several yearsA.has worked B.worked C,had worked D.has been working 请详细说明为什么
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Mr.white works as a journalist at present,but he ___in a high school for several yearsA.has worked B.worked C,had worked D.has been working 请详细说明为什么
Mr.white works as a journalist at present,but he ___in a high school for several years
A.has worked B.worked C,had worked D.has been working 请详细说明为什么

Mr.white works as a journalist at present,but he ___in a high school for several yearsA.has worked B.worked C,had worked D.has been working 请详细说明为什么
B 过去式
前面一句:怀特现在是记者.后面一句; 但是他以前在一个高中工作了7年.
所以是过去式 其他的全错

A
现在怀特先生当一名记者,但是他曾在高中工作几年。
这里的“他曾在高中工作几年”相对的时间是现在,从现在往前推移,事情已经完成,所以用现在完成时

【答案】 A.has worked
【解释】
for several years 表示持续了一段时间,是完成时的标志;又因为主句一般现在,所以用现在完成时
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A. has worked 是正确答案。
因为有 for several years 要用完成形式
b. 表示过去干什么,(因为有for severl years应该用完成形式) 所以不能用
c. 是指过去某个时间之前完成的动作,这里没有这个做参照的“过去某个时间”, 不能用。
d. 一直在干什么, 完成进行, 也不能用。...

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A. has worked 是正确答案。
因为有 for several years 要用完成形式
b. 表示过去干什么,(因为有for severl years应该用完成形式) 所以不能用
c. 是指过去某个时间之前完成的动作,这里没有这个做参照的“过去某个时间”, 不能用。
d. 一直在干什么, 完成进行, 也不能用。

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