this is an orange bus.is this?划线部分是an orange bus 选项：a.what color b.what c.how d.where到底a还是b。

This is a orange orange.This is an orange orangeThis is a orange orange.This is an orange orange.请问哪句正确? This is an orange orange.的同义句 This is an orange改为复数句 This is an orange.改为复数句. this is an orange改复数句 This is an orange改为复数句 This is an orange .[改为复数句] is this an orange?(做出否定回答) this an is orange jacket连句用 this an is orange jacket 连成一句话 This is an orange and that is an( ) 用A,an,The填空：This is ( )orange.( )orange is ( )orange.可以空着 this is an orange.it is orange.为什么第一个加an,而第二个不加an this is an orang对an orange进行提问 An orange is orange是什么意思 This is an orange.画线：“an orange”对该部分提问 orange is orange an orange is orange 那种说法对? This is ( )orange car. A.a B.an C.the This is an orange pencilcase.用that改为否定句