I knew nothing about dolphins I read an article about them.

A. because B. until C. but D. or

B 【解析】句意：我對海豚一無所知，直到我讀到一篇關于海豚的文章。A. because連詞，因為；引導原因狀語從句；B. until連詞，直到，引導時間狀語從句；C. but連詞，但是，表示轉折關系；D. or連詞，或者，表示選擇關系。根據(jù)上下文意可知，表示時間關系。故選：B。
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