The twin brothers stand under the tree and say nothing.A. puzzledB. puzzlingC. being puz

问题补充：

The twin brothers stand under the tree, and say nothing.

A. puzzled

B. puzzling

C. being puzzling

D. being puzzled

答案：

(答案→)A. puzzled

B. puzzling

C. being puzzling

D. being puzzled

解析：考察非谓语动词.句意:这对双胞胎兄弟站在树下,困惑不解不说一句话.过去分词表示句子主语发生过的被动动作,和句子主语是动宾关系.puzzle意思是使……困惑的意思，故选A。