把下面的词语补充完整。

（　　）秋时节　　景色（　　）人　　叠（　　）流金

（　　）林尽染　　五谷（　　）登　　春（　　）秋实

-The ground is wet.    

-It must have rained last night,_____?    [ ]

A. hasn't it        

B. didn't it    

C. mustn't it        

D. isn't it