After graduating from college, I took some time off to go travelling, turned out to be a w

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A. that
B. when
C. where
(答案→)D. which
解析： 考查定语从句。先行词是I took some time off to go travelling,整个句子，能引导先行词为句子的引导词只有which和as，所以定从    turned out to be a wise decision要用which引导。选D。