参考答案

正确答案：B
解析：本题测试非谓语动词的用法。在本句中，convince (使确信，使信服)和主语之间是被动关系，因此用过去分词。本句的意思是：“确信危险已经解除，他们都回到了村子。”例如：He came back to the classroom convinced that he had been forgiven by his teacher．