问题
选择题
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
答案：C
题目分析：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。