in his fifties=when he was ____ _____fifty

in his fifties=when he was ____ _____fifty in his fifties 和 in the fifties 的区别,还有in fifties是什么意思，在多少年代中间加不加the in his one 与in his fifties对吗? He became a famous writer when he was___选项：A.in his fifty B.in his fifities c.in fifty years old D.in fifties He became a famous writer when he was----------.A in his fifty B in his fiftiesC in fifty years old D in fifties选谁,为什么?谢谢啊 in his fifties 和 in the fifties 的区别 求英语高手. when he was retired and went back home in___ he was already in_____.A the fifties his sixtyB fifties his sixtiesC the fifties his sixtiesD fifty sixty Our English teacher is in his fifties.神马意思. 翻译：He began to take up painting in his fifties. he began to work THERE( ) A.on his fifty B.at age of fifty C.when he fifty D.in his fifties说原因 He began to work there ( )A.on his fifty B.at age of fifty C.when he fifty D.in his fifties marx began to learn russian---------.A.in his fifties B.at his fifties C.at the age of fiftiesD.in the fifties 为什么 英语翻译to -----north of the town there is---lakeJohn works in-----shop in London StreetHe was in-----hurry to catch----train------water is usefulMarx began to learn Russian When he was-----(his fifties)It is-----(fifth) largest river in ChinaMy 一道关于数词的题he began to work there_________A、on his fiftyB、at age of fiftyC、when he fiftyD、in his fifties我觉得 D B都对啊 He began to work there （ ）.A.on his fifty B.at the age of fifty C.when he fifty D.in his fifties选D,but为什么?每个选项的区别是什么?PLEASE```````` we were all surprised when he made it clear that he would leave office soon.其中的when he made it clear怎么解释,在句中的成分是什么 2）he's somewhere in his fifties He began to learn Chinese in his _____.A.fifty B.fiftieth C.fifties D.fifth Mark Twain became famous in his _.A fifties B fifty C fiftieth D the fiftieth