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What was the author reminded of after hearing his daughter's words?
A．How his daughter loved Cady.
B．When Cady became his friend.
C．Why they adopted Cady.
D．Where Cady was trained.
细节理解题。根据文中第五段中的“Then I remembered that the reason why I kept the stray(流浪的) dog in the first place was that we could not find a home for her and did not want her to be destroyed.”可知，女儿的话使作者想起来他们当初收养Cady的原因。故选C项。