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    精英家教网 > 高中英语 > 题目详情
    Every few years, the coal workers                 their lungs X-rayed to ensure their health.
    A．are havingB．haveC．have hadD．had had
    B
    考查时态。根据Every few years可知句子谓语要用一般现在时态。所以选B。
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