问题补充：
This is that dog.
A. as a big dog as
B. as big a dog as
C. a as big dog as
D. a big as dog as
答案：
A. as a big dog as
(答案→)B. as big a dog as
C. a as big dog as
D. a big as dog as
解析： This is as big a dog as that dog.= This dog is as big as that one.
