The twin brothers stand under the tree, and say nothing.
A. puzzled
B. puzzling
C. being puzzling
D. being puzzled
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(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。