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

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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

参考答案:

B根据时间状语every few years,可判断本句应为一般现在时，因此答案选B。

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