【题目】Mary felt sad over the loss of photos she had shot in Australia, ______ that was a memory she especially treasured.
A. as B. which C. when D. where
在线课程【答案】A
【解析】
试题分析：考查as引导原因状语从句。句意：玛丽对她丢失了在澳洲拍的照片感到很悲伤，因为那是她最珍贵的记忆。这是as引导的原因状语从句，表示“因为，由于”；if 只能引导条件状语从句；because of 引导原因状语从句前面不能加逗号；where引导地点状语从句。故选A。