The first decade of the 21st century the breathtaking and non-stop development of China.
A. witnesses
B. witnessed
C. will witness
D. had witnessed
网友回答
A. witnesses
(答案→)B. witnessed
C. will witness
D. had witnessed
解析：本题的关键词是句子的主语the first decade of the 21st century指过去的一段时间，做主语的时候谓语动词使用一般过去时。句义：21世纪最初的10年见证了中国令人窒息的不停顿的发展。故B正确。