Finally Mary was admitted by Beijing University, for which she ___ five times.选择题?

Finally Mary was admitted by Beijing University, for which she ___ five times.选择题?

题目
Finally Mary was admitted by Beijing University, for which she ___ five times.选择题?
Finally Mary was admitted by Beijing University, for which she ___ five times.
A:had tried B:was trying C:has tried D:tried
答案是A , D 为什么是错的呢?
答案
A是过去完成时,表示过去(was admitted)的过去.
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