Great changes in China since 1978.
A. took place
B. has happened
C. have taken place
D. happened
网友回答
A. took place
B. has happened
(答案→)C. have taken place
D. happened
解析：take place 表示“发生、举行、举办”，一般指非偶然性事件的“发生”，即这种事件的发生一定有某种原因或事先的安排；happen作“发生、碰巧”解，一般用于偶然或突发性事件。句意：自从1978年以来，中国发生了巨大的变化。结合语境可知本句描述的是现在已经完成的动作，故用现在完成时态，选C。