The girl that Peter had thought of someone to be avoided finally became his soul mate.A.

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A. to
B. upon
C. in
(答案→)D. as
解析：考查固定词组的被动语态。固定词组think of sth/sb as…认为某人/某物是…本题是其被动语态的形式。句意：那个Peter曾经认为是一个要避开的女孩最后成为他的终身伴侣。故D正确。