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

答案及解析： A

解析：

句意：詹妮对她在加拿大照的相片的丢失很伤心，因为那段经历是她特别珍惜的。as表“原因”；

if表“条件”；

when表“时间”；

where表“地点”，根据sad over这个关键词可知as为最佳选项。