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

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

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

A．are havingB．haveC．have hadD．had had

试题答案

B

解析

标签：theirworkersrayedlungscoal

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