Every few years, the coal workers                 their lungs X-rayed to ensure their health.
A．a(chǎn)re havingB．haveC．have hadD．had had
B
考查時態(tài)。根據(jù)Every few years可知句子謂語要用一般現(xiàn)在時態(tài)。所以選B。
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