Jenny was very sad over the loss of the photos she had shot at Canada, ________ this was a memory she especially treasured.

1. A.
   as
2. B.
   if
3. C.
   when
4. D.
   where

         Jenny was very sad over the loss of the photos she had shot at Canada, ____ this was a memory she

especially treasured.

A. as                                     B. if                                                 C. when                               D. where

 Jenny was very sad over the loss of the photos she had shot at Canada,          this was a memory she especially treasured.

     A. as             B. if          C. when            D. where

Jenny was very sad over the loss of the photos she had shot at Canada，　　 this was a memory she especially treasured.?

A.as　　　　　　　　　　 B.if?　　　　　　　 C.when　　　　　　　 D.where