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21、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

21、B

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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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