what's this?A this is key B it's key应该选几

this's what i What's this i( )Chinese? A：what's this（）? -What's this?-It's a-------. what's this ----this's a book 改错 What's this?This is a ruler.这句有什么错误, whats this?This is a M改错 what’s this (回答)( )( )a book what's this? what s this回答 whats this what's this是什么意思 What's this? 翻译 what’s this? what's this? what's this What’s.this.( )Chinese what's this?