he is the most famous explorer the world has ever known为啥用has ever known这个现在完成时态呢,要怎么解释比较好

英语翻译Gan yi a small In about lo million hecteres or whether is m cognacis of France's most famou here in grapes can be made in to town in southwest Fracnce aroundit ,wishin the scope varieties of grapes . he thinks football is the most ( )(interesting) but he is the most famous rooster in the world. 中考英语题..求高手解答17.I am Cindy Brown.You can call___Cindy.A.us B.him C.her D.me18.Most young people find___exciting to watch a football match.A.it B.this C.that D.one19.The girl___wib the match not so long ago is called Guo Yue,a famou He is one of the most famous________(write) he is the most beautiful scenery of my he is the most healthy man in family.改错 He most likes the color is green同义句 he is one of the America's most beloved poets 同义句转换：Which thing is the most important?He asked ___ ___ ___the most important. I am reading a book that is about a famous musician 还是应该说成The book I am reading is about a famou a musician he is my most loving he is a most respectable The most sad is not that he does not love me,but he cares about most people not me The most attract1ve is the most dangerous 改错:He is the most suitable student for the chairperson of the Students' Union. He is much the most clever of them all这句话怎么理解啊尤其是 much the most who is ANDY Lau he is only the most amazing performer ever?