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


  1. A.
    are having
  2. B.
    have
  3. C.
    have had
  4. D.
    had had

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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

 

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

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C. have had
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