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C. has taught
D. will be teaching
17. It was really very dangerous; you
________
him seriously.
A. might have injured
B. could injure
C. should have injured
D. must injure
18. ________ in my present work, I would be quite willing to do what you ask me to.
A. Were I not engaged
B. I were not engaged
C. Engaged I were not
D. Were not I engaged
19. The time was not far off when he
________
this decision.
A. has regretted
B. had regretted
C. will regret
D. would regret
20. This is the hour ________ the place is always full of women and children.
A. that
B. when
C. where
D. how
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