She ______for four years by the time she takes her qualifyin

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She ______for four years by the time she takes her qualifying examination for Doctor of Law in 2000
A)studied law B)had studied law
C)will have been studying law D)had been studying law
答案为什么是C

c选项是将来完成进行时
因为语句中 she takes her 用的是一般现在式,所以说明2000年应该是将来的年代（请问这是哪年的题啊?2000年之前的吧）,就是说事情发生在2000年之前,所以用将来时.
然后,因为她的学业必须在考试之前结束,所以用的是完成时,在考试之前她就已经学完了.
最后,因为这件事要一直延续,所以用进行时.
所以选c
这是分开来说,专业讲解如下：
将来完成进行时
构成：主语+ shall/will have been doing 将来完成进行时表示动作从某一时间开始一直延续到将来某一时间.是否继续下去,要视上下文而定.这个时态常和表示将来某一时间的状语连用.
如:I shall have been working here in this factory for twenty years by the end of the year.到今年年底,我将在这个工厂工作20年了
If we don't hurry up the store will have been closing before we get there.咱们如不快一点儿,等我们到了那儿,店门就会关了.
The play is coming off in August.By then the play will have been running for three months.这个剧将于8月停演.到那时为止,这个剧将连演三个月了.
〔注〕在下列句子中,will是情态助动词,有“大概”或“我想”的含义.
如：①You’ll have been wondering all this time how my invention works.我想你这些时候一直想知道我的发明是怎样工作的吧.
②They will have been having a holiday yesterday.他们昨天大概是在度假来着.
将来完成进行时和将来完成时的区别：将来完成进行时强调动作过程在另一动词之前的长度.而将来完成是更强调在另一件事前一个动作的完成.
如：By the time John retires,Janes will have been practicing for 10 years.

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