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

发布时间：2020-08-17 02:29:45

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：句意：每个几年煤矿工人就要进行一次肺部x光检查来确保他们的健康。这是经常性的行为，故用一般现在时，故选B。
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