The dog is very and it can work out the problem.A. smart; easyB. smart; easilyC. smartly

问题补充：

The dog is very , and it can work out the problem.

A. smart; easy

B. smart; easily

C. smartly; easily

D. smartly; easily

答案：

A. smart; easy

(答案→)B. smart; easily

C. smartly; easily

D. smartly; easily

解析：smart形容词，聪明的，精明的；smartly副词，精明地；easy形容词，容易的；easily副词，容易地。句意：这条狗非常聪明，它能轻松地算出这道题来。结合语境可知前一空用形容词做表语，后一空用副词做状语。故选Ｂ。