Every year, the coal workers         their lungs X-rayed to ensure their health.
A．a(chǎn)re havingB．have hadC． haveD．had had
C
考查時(shí)態(tài)題。根據(jù)時(shí)間狀語every few years,可判斷本句應(yīng)為一般現(xiàn)在時(shí)，have lungs X-rayed意思是“請(qǐng)人檢查肺”。因此答案選C。
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