I knew nothing about dolphins I read an article about them.A. because B. until C. but D. or B [解析]句意:我对海豚一无所知.直到我读到一篇关于海豚的文章.A. because连词.因为,引导原因状语从句,B. until连词.直到.引导时间状语从句,C. but连词.但是.表示转折关� 题目和参考答案——青夏教育精英家教网—

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

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

B 【解析】句意：我对海豚一无所知，直到我读到一篇关于海豚的文章。A. because连词，因为；引导原因状语从句；B. until连词，直到，引导时间状语从句；C. but连词，但是，表示转折关系；D. or连词，或者，表示选择关系。根据上下文意可知，表示时间关系。故选：B。

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