It's n____ for you to study hard if you want to get good grades

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It's n____ for you to study hard if you want to get good grades

It's n____ for you to study hard if you want to get good grades
It's n____ for you to study hard if you want to get good grades

It's n____ for you to study hard if you want to get good grades
necessary
必要的

necessary.

necessary