It was______he saw the doctor coming out of the emergency room with an expression as grave as a judge______he realized the serio

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问题 It was______he saw the doctor coming out of the emergency room with an expression as grave as a judge______he realized the seriousness of his wife’s illness.

选项 A、not until...that
B、after...when
C、until...then
D、before...that

答案A

解析 本题考察it is not until…that…结构的用法。
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