You ought to _____ a test in physics the day before, I think.
A. have taken
B. take
C. be taken
D. be taking
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Kepler proved that the sun ______ the center of the solar system.
A. is
B. was
C. had been
D. would be
This is one of the best novels that ______ this year.
A. appears
B. is appearing
C. has appeared
D. have appeared
My friend ______ here last week, but he couldn’t.
A. was to have come
B. must have come
C. came
D. had to come
He did not arrive until the meeting was nearly over, for the simple reason is that he _____ asleep while watching television.
A. had fallen
B. has fallen
C. fell
D. was falling