In spite of the ever-increasing exploitation of natural resources, that has now reached dangerous proportion, little has been

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问题  In spite of the ever-increasing exploitation of natural resources,  that has now reached dangerous proportion,  little has been done  on a world-wide scale to slow down or stop this process.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为which,只能用which引导非限制性定语从句。
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