( ) eraser is on Jack's desk,is it yours?A.The B.An请问括号中应该选择哪个选项?请简要说明理由!

Where is Alice is eraser?H_______is on the desk. there is an eraser on the desk 对划线句提问 an eraser 划线 There is a eraser on the desk改错 his eraser is (on the desk)对括号部分提问 what is on the table?回答what is on the table?A It's an eraser B They're eraser C That's an eraser D The eraser 选哪个 为什么?如何理解提问主语? Excuse me,is this your eraser,Eric?( )eraser on the desk?Oh,no,it's Linda's.填冠词 --is that( )eraser?--yes,it,s( )eraser. It is an eraser. That is ( ) eraser. It is an eraser? betty is on duty today.she is c___ the blackborad with an eraser. look!() eraser is on the desk,whose is it?A .A B.An C .The D./ there is an eraser on the desk.[改为发复数句] The eraser is on the her desk.什么地方错了,请改正 Is that your eraser?(改为同义句）Is----------eraser-----------? 是This eraser is mine还是This eraser is my? This is ( )eraser. ( )eraser is in the pencil case . I guess this is eraser.