It was not () he took off his glass () I realized who he was.

科目名称：理工英语3

试卷号：11377

题型：词汇与结构(单选题)

题目：It was not () he took off his glass () I realized who he was.

选项：1. when... that 2. until... when 3. until... that

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答案：until... that