They_____us since five o'clock this morning.(A)are helping (B)have beng helping (C)have beng helped (D)have helped

分类: 作业答案 • 2021-12-20 02:22:02

问题描述：

They_____us since five o'clock this morning.
(A)are helping (B)have beng helping (C)have beng helped
(D)have helped

答

b 因为是从今天早上五点到现在还在帮助我们
而且有since 提示
所以用现在完成进行时