题目内容
.（上海卷28）. 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
B
练习册系列答案
相关题目
题目内容
.（上海卷28）. 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
B