Every few years, the coal workers ___________ their lungs X-rayed to ensure thei
题型:不详难度:来源:
Every few years, the coal workers ___________ their lungs X-rayed to ensure their health.A.are having | B.have | C.have had | D.had had |
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答案
B |
解析
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。 |
举一反三
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