2.There is a big dog _______to a fence outside the house.　A.tying B.tied C.to tie D .ties4._______the early train,you'll have to get up early and rush in a taxi.A.Catching B.Caught C.To catch D.Catch4为什么不选D?

2.There is a big dog _______to a fence outside the house.为什么不能选A?求详解2.There is a big dog ___A____to a fence outside the house.　　A.tying B.tied C.to tie D .ties This is a big dog改成感叹句 there might be a big dog ____ there.A sit B sat C sitting 选C 为什么 sitting前不加is this is a big dog.对big提问,用How this is a big dog.对big提问,用How There is a big dog _____to a fence outside the house.为什么不选C?A.tyingB.tiedC.to tieDties There is a big house. There is a big shopping ( ) There is a big shopping ( ) There is a big school there's a big dog in front of the 什么the table there is a dog There is a dog near the dor this is a big dog的意思快 将 it is a big dog 改成一般疑问句 this is a dog._eyes are big and black. The dog is big (small). 5.little a dog there in is the big car 6.young in blue man the shirt uncle her is a 连成陈述句