关于all the time用法

问题描述:

关于all the time用法
I want to thank Jack because he _______ me all the time
A.encouraging.B.will encourage.C.has been encouraging
D.encouraged

当然选C all the time一直,在此用完成进行时表从过去持续到现在有可能持续到将来,A 少了谓语动词is