Every few years, the coal workerstheir lungs X-rayed to ensure their health.A. are having

发布时间：2020-08-16 19:36:25

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

网友回答

A. are having
(答案→)B. have
C. have had
D. had had
解析：考查时态。根据Every few years可知句子谓语要用一般现在时态。所以选B。
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