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高二英语question!In1988,hisbest-sellerABriefHistoryofTimewaspublished,whichheputforwardtheidea23timeitselfhasabeginning,andthatitwillhaveanend.Inconclusion,hehasmadeoutstandingcontributionstothefieldsof

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高二英语question!
In 1988,his best-seller A Brief History of Time was published,【 】 which he put forward the idea 23 time itself has a beginning,and that it will have an end.In conclusion,he has made outstanding contributions to the fields of cosmology and quantum gravity.
为什么是填in?我填了to 我觉得是因为put forward to
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答案和解析
in which 指的是in his best-seller A Brief History of Time.
put forward the idea 的意思是提出想法看法.