ls this _book?A:your B:you C:yours选择正确的词

ls this _book?A:your B:you C:yours选择正确的词 英语ls this your ls this your ls this your school? ls this ruler_?A:yours B:you C:your ls++this++your++school是什么意思 ls this a picture是什么意思 ls this your computer?改为肯定陈述句 ls this your schoolbag的中文是什么 ls this your eraser?做出否定回答 ls this your ruler改为复数句 ls this your backpack? 改为陈述句 ls this your mobile作肯定回答 ()25.ls this ___________ English book?A.a B.l C.your D.you ls this a bus复数句 ls this your pen?yes,itisn't 哪里错了? ls this your pen?(改为肯定句） ls this your pen改为否定回答,怎么改