The English teacher her students how to improve their prehension skill since last week.
A. has told
B. is telling
C. has been telling
D. will have told
网友回答
A. has told
B. is telling
(答案→)C. has been telling
D. will have told
解析：根据时间状语since last week可知，自从上周英语老师一直都在告诉学生如何提高阅读理解的问题，表明动作从上周开始一直延续到现在，故用现在完成进行时。句意：英语老师从上周一直都在告诉他的学生如何提高阅读理解的技能。根据句意选C。