请帮我讲解一下英语单词的用法.1 percent percentage2add addition addtional3confusing confused confusion4complain complaint另外请帮我讲解一下表语从句的语法!还有other states have a sales tax,which is charged to any item wh

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请帮我讲解一下英语单词的用法.
1 percent percentage
2add addition addtional
3confusing confused confusion
4complain complaint
另外请帮我讲解一下表语从句的语法!
还有other states have a sales tax,which is charged to any item which you buy in that state.这个句子中为什么用to!

to表实方向,表税收追加在你在那个你买物品的州里