Only after he realized the significance of mastering two languages __________ English carefully.
#82816
A
did he set about learning
B
did he set out learning
C
had he set about learning
D
had he set out learning
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Not until _______ home _______ her appointment with the doctor.
#82872
A
she arrived; did she remember
B
did she arrive; that she remember
C
she arrived; when she remembered
D
did she arrive; had she remembered
I failed again in the examination and only then_______how much time I had wasted.
#84160
A
I realized
B
I had realized
C
did I realize
D
had I realized