↑ 收起筛选 ↑
试题详情

He _______ around the clock since June, when the first Ebola case appeared in this agricultural county.

A. had been working  B. has been working

C. is working       D. was working

高三英语单项填空简单题

少年,再来一题如何?
试题答案
试题解析
相关试题