I didn't realize he was a famous scientist you told me.

A. until B. because C. since

A 【解析】句意：直到你告訴我，我才知道他是一位出名的科學家。A. until到…為止；B. because 因為；C. since既然，因為。本題考查固定句式not…until…直到……才。其用法是如果（主）句中的謂語是終止性動詞，應采用“not…until”結構，意為“到……時候才” 根據(jù)句子結構，結合選項，故選A。
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