(单选题)

Three teenagers witnessed a murder when they were taking a picture, and they came back, and .

A.frightened, trembling

B.frightful, trembling

C.frightening, trembled

D.frightened, trembled

参考答案：A

参考解析：

考查非谓语动词。句意：三个十几岁的孩子在拍照时目睹了一起谋杀案，他们回来时，吓得浑身发抖。分析句子结构可知，______ and ______充当状语，修饰主语，three teenagers和frighten之间是被动，和tremble之间是主动，所以A项正确。故选A。

知识点：

Three teenagers witnessed a murder when they were taking a picture, and they came back, ______ and ______.