问题
选择题
When I was in primary school, I was told that the earth ______around the sun.
A．had travelled
B．would travel
C．travels
D．travelled
答案
答案：C
考查时态。客观真理的动词形式即使在过去也是用一般式,因为这个动作是一个客观的持续,过去或者现在或者将来都不会改变。所以用的是现在式，选C。