问题描述：
For students only rest is not enough.So such a conditiong shouid be ___ to give
For students only rest is not enough.So such a conditiong shouid be ___ to give
students both pleasure and knowledge.
A kept B changed C same D different
For students only rest is not enough.So such a conditiong shouid be ___ to give
students both pleasure and knowledge.
A kept B changed C same D different
问题解答：
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