is this your rulerAyes,it's Byes,this is Cno,it isn's Dno,it is

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is this your rulerAyes,it's Byes,this is Cno,it isn's Dno,it is
is this your ruler
Ayes,it's Byes,this is Cno,it isn's Dno,it is

is this your rulerAyes,it's Byes,this is Cno,it isn's Dno,it is
Is this your ruler?C,No,it isnit.
肯定回答时,it is不能缩写,也不能写成this is或that is.