正确答案是D,但是为什么?He is the only one of the students who --- a winner of scholarshipfor three years. A.is B.are C.have been D.has been

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正确答案是D,但是为什么?He is the only one of the students who --- a winner of scholarshipfor three years. A.is B.are C.have been D.has been
正确答案是D,但是为什么?
He is the only one of the students who --- a winner of scholarshipfor three years. A.is B.are C.have been D.has been

正确答案是D,但是为什么?He is the only one of the students who --- a winner of scholarshipfor three years. A.is B.are C.have been D.has been
上面的句子意思是“他是学生当中唯一一个连续三年都获得奖学金的”.这里指过去三年的情况,所以用完成时比较合适,先排除A和B.其次,要看清楚定语从句修饰的是那一部分,从意思判断,这里的从句是修饰the only one student的,所以应该选表示单数的D.
比较：He is one of the students who --- a winner of scholarship for three years.
这时就应该选C,因为这里的意思是“他是其中一个连续三年都获得奖学金的学生”,定语从句修饰的是the students.

for three years是一个时间段，所以要用完成时，排除A和B；he是第三人称单数，要用has而非have。所以选D。

表示对现在造成的影响
所以用现在完成时

因为后面有个three years.
有时间段就应该用完成时态

首先,"for three years"表示"持续三年"
像这样表持续多久的时间状语通常与完成时态连用
表达"持续三年都赢得奖学金"的状态
其次,这句话的主语是"He",即第三人称
所以把C选项也排除了
最后选D

for three years表明一端时间,所以用完成时态.
who指代的是主语He一人单数,用has

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