.（上海卷28）. 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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.（上海卷28）. 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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