单选题
1.00分
He kept in constant contact with his family while he was in Australia.
参考答案: B
参考解析: 本句意思:在澳大利亚时他经常与家人联系。constant的意思是“接连不断的,持续的”, 与regular意思相近。gradual逐渐的,逐步的;direct直接的;occasional偶然的。