题目内容

Kepler proved that the sun ______ the center of the solar system.

A. is
B. was
C. had been
D. would be

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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

We had hardly sat down when she ______ plates of food for us.

A. brought
B. has brought
C. had brought
D. was bringing