英语单项选择 Maybe you don't know _______ it's polite or not to sp

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英语单项选择 Maybe you don't know _______ it's polite or not to speak loudly at the table
A.if B.whether C.that D.what 顺便说说理由.

B
固定用法
whether ...or not 是否

再问：问下这不是引导宾语从句么不是应该用that么、
再答：是宾语从句，但这里的引导词不是that （如果用that ，可以省略，你试翻译这个句子看，省略了引导词还通顺吗？）

英语单项选择 Maybe you don't know _______ it's polite or not to sp 英语翻译Some small children don't know it's not polite to laugh 英语填空：Don't _______(大声喊)at anyone. It's not polite. 英语单项选择：1.Where was Alice’s sister?I don’t know where _______ 英语翻译Some small children dont't know it's not polite to laugh it is not polite （） you to eat from other's plates?of or for Don't l______ at others It's not polite Don’t b_____ at anyone .It's not polite 单项选择,1.--Don't you want to be a singer?--_______,I want to b 单项选择.1、It's easy to （） in a big city if you don't have any I don't know what to say well,maybe it's the man 单项选择.1:I ( )like chicken.It's yummy.A:don't.B:not.C:/.