We can obviously notice that over a period of no practice what has been learned tends to be forgotte

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We can obviously notice that over a period of no practice what has been learned tends to be forgotten from______.

参考答案:

dramatic instances of sudden forgettingdramatic instances of sudden forgetting 解析:细节题。答案在第二段第三行:dramatic instances of sudden forgetting can be seen to be adaptive.(戏剧性的突然忘记可以被视为具有适应性。)