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
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：打开浓盐酸瓶塞，有大量白雾，烟指的是固体。故选A。
