问题描述：
Sometimes it's not_to know the parts of a new word to understand it,but it will help you many times
Sometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.
为什么要填enough?helpful和useful不可以吗?
Sometimes it is not__ to know the parts of a new word to understand it,but it will help you many times.
为什么要填enough?helpful和useful不可以吗?
问题解答：
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