There is Aa delicate balance of nature Bwhich many square miles of ocean and vegetation and clean air Care needed to maintain on

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问题 There is Aa delicate balance of nature Bwhich many square miles of ocean and vegetation and clean air Care needed to maintain only Da relatively few human beings.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为where。分析句子结构可知,此处为定语从句,引导词在从句中作地点状语,所以应用where引导。
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本试题收录于: 英语题库普高专升本分类
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