Theownersofmanycoalminesmust_____

发布时间：2020-07-27 04:23:39

The owners of many coal mines must ________ measures which ________ improve working conditions.A.take; tends toB.take; tend toC.make; tend toD.have; tends to

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B解析take measures采取措施；定语从句中的谓语动词的数取决于它所修饰的先行词的单复数形式。
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