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

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

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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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