Every few years, the coal workers their lungs X-rayed to ensure their health. A. are having B. have...
2023-01-17 18:26:45 176次 2010-2011学年海南省高三上学期教学质量检测（三）英语卷 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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