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问题

So between 1510 and 1514 Copernicus worked on it, gradually _____ his theory until he felt it was complete. [ ]

A: to improve
B: to be improving
C:/T
D: improved
正确答案是:
同类题型

Many students ______ changes to show themselves in class because the class size is too big.

What are you packing so many books for, Grandma— I’ll _________ to the kids in West China.

I have _____ football. Would youlike to play ______ football with me

Please keep the secret to ________, children! Don’t let anybody else know it.

no enough time to practice, the girlwondered whether she _____ pass the driving test.

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