for the third time用哪个疑问词提问

whichHe turns right a third time.他又一次向右转.He turns right the third time.他第三次向右转． a third/the third 是有区别的.a third 译为”又一,再一”表示已经转了两次弯了,现在是第三次转弯．意思上和无大区别．只是译法不同． 语法总结：序数词（first,second,third,fourth－－）前加a/an意为”又一,再一” 例句：I`ve read the book a second time.这本书我又读了一遍.for后面可以加次数,这是固定用法．