解析:根据句意,Tim Bemers-Lee创立万维网应该是过去的事情,而且be considered后面应该用动词不定式,所以应该用to have done,答案为A。 原则四、非谓语动词作定语时,表示将来用-to do,表正在进行用-ing,表示已经完成用-ed 例7. The play___ next month aims mainlyto r...
go away 走开,离去 go by 走过; 经过; 过去 2007、36 Until 1954 it was thought that no man could run one mile in less than four minutes. As years 36 ,the record came closer and closer to four minutes 36.A.passed along B.passed down C.went by D.went ov...
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