Not until I went to America ____ what kind of a country she is.
A. did I know
B. I know
C. I didn't know
D. I could know
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____, she would have avoided the accident.
A. She was more careful
B. If she was more careful
C. Had she been more careful
D. She had been more careful
____ dark was the night that we had to rely on our ears instead of our eyes.
A. How
B. Very
C. Extremely
D. So
____ did he realize that he had made a mistake.
A. Upon entering the classroom
B. Only after entering the classroom
C. After he had entered the classroom
D. As soon as he entered the classroom
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
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