↑ 收起筛选 ↑
试题详情

Every few years, the coal workers________ their lungs X-rayed to ensure their health.

A. are having          B. have     C. have had             D. had had

高三英语单项填空中等难度题

少年,再来一题如何?
试题答案
试题解析
相关试题