So between 1510 and 1514 Copernicus worked on it, gradually _____ his theory until he felt it was co

题目简介

So between 1510 and 1514 Copernicus worked on it, gradually _____ his theory until he felt it was co

题目详情

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. improving
D. improved
题型:单选题难度:中档来源:0101 期末题

答案

C

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