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

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

选项 A、Although
B、However
C、When
D、Since

答案D

解析本题测试连词的用法。根据前后句意衔接，应该是因果关系，故答案只能为D，Since在这里表示原因。Although虽然：However然而；When当……时候。

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