a closed book的意思是something who doesn't know的意思吗?

a closed book的意思是something who doesn't know的意思吗? i'm a closed book 是注册NETLOG里面有一项叫“Sexual preferences”的选项 SOM的意是 a closed book an open book on the books black book 要有权威性的, take a book,leave a book 是神马意思是《英语街》的 a guide book的意思 SOm啥意思 什么意思som buy me a book buy a book for me 是相同的意思吗? a book on 是有关.的书的意思吗》 求解 这个英语句型怎么造句a cloed book to sb打错一个单词 是closed But som things can be very diffcuit.的中文意思 The robbery case is closed.的意思 I have a book的一般疑问句是Have you a book 还是 Do you have a book两个一般疑问句意思有什么不同, a book sale 的中文意思 i want a book 的意思 a book for my friend的意思 a useful book的中文意思