They look happily at the photos taken on the beach.用happy还是happily?

题目

They look happily at the photos taken on the beach.用happy还是happily?

答案

应该是happily.因为这里的主要动词是look at,taken on the beach是过去分词作定语.副词才能修饰动词,所以是happily.
如果是要表达“看上去很开心”,则是they look happy.
但是look at是“看.”