Tom said that he had begun the work______.

问题描述:

Tom said that he had begun the work______.
A.for a month
B.a month ago
C.a month befor
D.a month later
为什么选D项?D项和C项有什么区别呢?

我个人认为答案应是a,已经开始一个月- -你够了啊。。。本来就是,完成时后跟for or since反正不选A你错了随便你