1.both ...and (use后加both..and连接的宾语,不可能use or/and,除非后面也是动词)
2.was picked 从in 1957可知是过去时,他被选为,要用被动.
3.hadn't been 虚拟语气用法,与过去事实相反 if从句had done,主句would/could/...have done;与现在事实相反：If ..did(be动词用were),主句...would/could...do; 与将来事实相反：If...did/should do / were to do,主句...would/could...do.
4.such a (such a +形容词+单数、such +形容词+复数/不可数;so +形容词+a +单数)