单选题：It was ______ he saw the doctor coming out of the emergeney

题目分类：英语
题目类型：单选题
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题目内容：

It was ______ he saw the doctor coming out of the emergeney room with an expression as grave as a judge _______ he realized the seriousness of his wife's illness. A．not until…that
B．after…when
C．until…then
D．before…that

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