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.（ ）
- A.not until...that
- B.after...when
- C.until...then
- D.before...that
正确答案及解析
正确答案
A
解析
本题考察it is not until...that...结构的用法。
