The twin brothers stand under the tree, ______ and say nothing. A．puzzled B．

A
考察非謂語(yǔ)動(dòng)詞.句意:這對(duì)雙胞胎兄弟站在樹(shù)下,困惑不解不說(shuō)一句話.過(guò)去分詞表示句子主語(yǔ)發(fā)生過(guò)的被動(dòng)動(dòng)作,和句子主語(yǔ)是動(dòng)賓關(guān)系.puzzle意思是使……困惑的意思，故選A。