Every few years, the coal workers their lungs X-rayed to ensure
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
考查时态。根据Every few years可知句子谓语要用一般现在时态。所以选B。 |
举一反三
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