【考点一】when用作关系副词,用来引导定语从句。1.The days are gone_____physical strength was all you need to make a living.A.when B.that C.where D.which2.She will never forget her stay there_____she found her son who had gone missing two years before.A.who B.which C.why D.when3.The book was written in 1946,_____the education system has witnessed great changes.A.when B.during which [Test center] when used as an adverb of relation, used to guide attributive clause. 1.The days are gone_____physical strength was all you need to make a living.A.when B.that C.where D.which2.She will never forget her stay there_____she found her son who had gone missing two years agoA.who B.which C.why D.when3.The book was written in 1946, _____ the education system has witnessed great changes.A.when B.during which