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Asaresult,fewcompaniesarenowsupportingthekindoflong-termresearchonwhichUSleadershiphasbeenfounded.请问这个定语从句whichUSleadershiphasbeenfounded的先行词是什么?为什么要介词on,是介词提前吗?whichUSle

题目详情
As a result,few companies are now supporting the kind of long-term research on which US leadership has been founded.
请问这个定语从句 which US leadership has been founded的先行词是什么?为什么要介词on,是介词提前吗?which US leadership has been founded.
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答案和解析
which US leadership has been founded的先行词是research
介词on 是介词提前
结果,几乎没有公司支持这项长期研究,美国的领导关系是基于这样研究建立的.