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It was not until she had arrived home _____ her appointment with the doctor.

 A. did she remember     B. that she remembered

 C. when she remembered  D. had she remembered

Not until I began to work ________ how much time I had wasted.

A. didn’t I realize                              B. did I realize C. I didn’t realize                              D. I realize

It was not until dark ______ he found that it was the correct way to solve the problem.

A．that              B．what             C．which            D．when

It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.

It is not until the disease has progressed to AIDS ____a person begins to look sick.

A．who             B．that              C．where            D．before