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Every few years, the coal workers ___________ their lungs X-rayed to ensure their health.
A.are havingB.haveC.have hadD.had had
B
本题考查时态。根据时间状语every few years,可判断本句应为一般现在时,因此答案选B。句意:每过几年,煤矿工人都要做X射线保证他们的健康。
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