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英语语法问题Four long passages are provided ,and a time limit is a

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英语语法问题
Four long passages are provided ,and a time limit is also given for reading each passage.请问这里time limit前面为什么有一个不定冠词a?limit是可数?
英语语法问题Four long passages are provided ,and a time limit is a
 N-COUNT\x05极限 A limit is the greatest amount,extent,or degree of something that is
possible. 

Her love for him was being tested to its limits...\x05
她对他的爱经受着极其严峻的考验.

2. N-COUNT\x05(特定的)限期,限额,限度 A limit of a particular kind is the largest or smallest amount of something such as time or money that is allowed because of a rule,law,or decision. 

以上例句来着
柯林斯高阶英汉词典  说明可以
再问: 但是没说明为什么这里limit是可数的
再答: 没有为什么可不可数....英语规定它是可数它就是