have Do does Is isn't has are am
口算
30×2= 40×2= 40×4= 40×5=
50×5= 60×2= 60×3= 60×4=
80×4= 80×2= 90×9= 90×6=
下列词语书写全部正确的一项是( )
唐朝时候,天竺先后十多次派“遣唐使”到中国来学习交流。____