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

A. until B. because C. since

【答案】A

【解析】句意:直到你告诉我,我才知道他是一位出名的科学家。A. until到…为止;B. because 因为;C. since既然,因为。本题考查固定句式not…until…直到……才。其用法是如果(主)句中的谓语是终止性动词,应采用“not…until”结构,意为“到……时候才” 根据句子结构,结合选项,故选A。

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