改错Helen has tried twice ,and she is asked to have the third try

改错Helen has tried twice ,and she is asked to have the third try

题目
改错Helen has tried twice ,and she is asked to have the third try
答案上说把the改成a,表又一,再一.我觉得 the third 表第三次也讲得通啊,她被要求去进行第三次尝试,有什么不对吗?
答案
the third try强调第三次尝试
a third try强调前面已经有了一次次的尝试,现在又是一次,强调(又一次)
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