How long has peter been reading the book?选项再补充A an hour agoB before an hour agoC since an hour agoD for an hour ago

分类: 作业答案 • 2022-06-07 19:44:56

问题描述：

How long has peter been reading the book?选项再补充
A an hour ago
B before an hour ago
C since an hour ago
D for an hour ago

答

C 典型的现在完成时的时间状语