______ pollution control measures tend to be money consuming, many industries hesitate to adopt them.

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:12:16 免费下载:《单选题》Word试卷

______ pollution control measures tend to be money consuming, many industries hesitate to adopt them.
A.Although
B.However
C.When
D.Because

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