______pollution control measures tend to be money consuming, many industries hesitate to adopt them.
A、
Although
B、
However
C、
When
D、
Since
【正确答案】
D
【答案解析】
解析:在做此题时根据前后句意衔接,我们知道应该是因果关系,故答案只能为D。since在这里表示原因。although意为"虽然";however意为"然而;when意为"当…时候"。
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