Was it not until you began to work —— how much time you had wasted?
#79964
A
did you realize
B
that you realized
C
did you not realize
D
that you didn’t realize
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Only when he met the girl his aunt introduced to him ____ that he had seen her before.
#82277
A
he realized
B
he did realize
C
realized he
D
did he realize
I will answer the teacher’s question when _______. 
#82051
A
I ask
B
I will be asked
C
asked
D
I shall be asked
It was not until 1978_____ set free from the prison.
#80908
A
that the old professor was
B
did the old professor
C
was the old professor
D
that was the old professor