What is not necessary for other’s help? Excessive ______ .

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问题 What is not necessary for other’s help?
Excessive ______ .  
What is not necessary for other’s help?

选项

答案expressions of thanks

解析 根据文中“excessive expressions of thanks are not necessary”可知过多地表达谢意是不必要的,故此处应填“expressions of thanks”。
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