Though you have taken lots of ______,you have to do the ____on page 35.(exercise)正确答案给的是 exercise,exercises.请问为什么第一个不能是复数,exercise做练习讲不是可数名词吗?

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Though you have taken lots of ______,you have to do the ____on page 35.(exercise)正确答案给的是 exercise,exercises.请问为什么第一个不能是复数,exercise做练习讲不是可数名词吗?
Though you have taken lots of ______,you have to do the ____on page 35.(exercise)
正确答案给的是 exercise,exercises.
请问为什么第一个不能是复数,exercise做练习讲不是可数名词吗?

Though you have taken lots of ______,you have to do the ____on page 35.(exercise)正确答案给的是 exercise,exercises.请问为什么第一个不能是复数,exercise做练习讲不是可数名词吗?
第一个是锻炼、练习,是抽象名词,不可数;
第二个是练习题,具象名词,可数.