3.As he grew older,he began to go deaf. _______________________________________________________ 4.By the late 1960s,their music had changed completely. __________________________________________________________________________
到20世纪60年代末期,他们的音乐完全发生了改变。(by the late 1960s作时间状语)
随着年龄的增长,他的耳朵变聋了。(as引导的时间状语从句)