October 7, 2015

Homework Help: English

Posted by Ramesh Reddy on Friday, August 29, 2014 at 4:48am.

When I went back to my home town three years ago, I found that a lot of changes ____.

(A) are taken place
(B) were taken place
(C) have taken place
(D) had taken place
I answered it as B. but in the book the correct answer was D. please explain by giving examples.

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