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
本題考查時態(tài)。根據(jù)時間狀語every few years,可判斷本句應為一般現(xiàn)在時，因此答案選B。句意：每過幾年，煤礦工人都要做X射線保證他們的健康。
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