The puter was invented in the 1940’s and quite a lot ever since.
A. was changed
B. had changed
C. has been changed
D. will change
网友回答
A. was changed
B. had changed
(答案→)C. has been changed
D. will change
解析：考察时态。本题的关键在于后面的时间状语ever since自从，该短语要和现在完成时连用。句意：电脑是20世纪40年代发明的，从那以后一句发生了很大的改变。故C正确。