tim has been in australia for six mouth.his brother hasn't seen him _january.

分类: 作业答案 • 2021-12-01 09:26:10

问题描述：

tim has been in australia for six mouth.his brother hasn't seen him _january.
1for
2since
3from
4by
为什么

答

前面是hasn't seen,是完成时,与完成时连用的只有since
所以选2
Do you understand?