Scarcely ____ when the murderer shot him down.
A. did he finish his opening address
B. he did finish his opening address
C. had he finished his opening address
D. he had finished his opening address
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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
____, 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
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