问题补充:
We are now in the age of great changes. Everything sometimes before it is felt.
A. change
B. had changed
C. has changed
D. changed
答案:
A. change
B. had changed
(答案→)C. has changed
D. changed
解析:整个句子用的都是现在时,所以排除BD选项。主语是“everything”故排除A选项。用现在完成时强调结果。句意:我们现在处在伟大的变革时代。常常是等到一切变化了我们才感觉到。