I am too tired.I have studied for long( ).A.time B.times 应该选哪一个啊?为什么?

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I am too tired.I have studied for long( ).A.time B.times 应该选哪一个啊?为什么?
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I am too tired.I have studied for long( ).A.time B.times 应该选哪一个啊?为什么?
I am too tired.I have studied for long( ).A.time B.times 应该选哪一个啊?为什么?

I am too tired.I have studied for long( ).A.time B.times 应该选哪一个啊?为什么?
a for a long time 固定搭配
time 做时间讲不可数 不能加复数

time
times 是次数