the past few years great___great changes in modern science and technology in ChinaA.witnessB.have witnessedC.witnessedD.had witnessed

分类: 作业答案 • 2021-12-20 03:07:42

问题描述：

the past few years great___great changes in modern science and technology in China
A.witness
B.have witnessed
C.witnessed
D.had witnessed

答

答案选B
现在完成时态