the company has been producing this model of machine tool( )2008.

分类: 作业答案 • 2021-12-31 20:43:18

问题描述：

the company has been producing this model of machine tool( )2008.
A.since B.after C.fpr D.before

答

A
现在完成进行时,表示从过去某个时间点开始进行、并将继续进行下去的情况,时间多用since.