Every few years, the coal workers their lungs X-rayed to ensure their health. A．are having B．have C．...
2022-12-21 23:22:11 58次 2012-2013学年云南省景洪市高三上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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