Those have difficulty in working out the maths problems can ask the maths teathers for advice.

Those have difficulty in working out the maths problems can ask the maths teathers for advice.

题目
Those have difficulty in working out the maths problems can ask the maths teathers for advice.
这是一道改错题,请问哪里错了?为什么错了呢?
答案
Those who have difficulty in working out the maths problems can ask the maths teathers for advice
如果不加who
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