第23题: [单项选择]None of the soldiers was allowed to open fire unless heavy loss was shown to be ______ inevitable. A. nonetheless B. otherwise C. hence D. therefore 参考答案:B 答案解析:[注释] 本题需要注意一些常用过渡性副词的用法。A. nonetheless表示转折; B.otherwise表示条件;C.hence和D.therefore表示因果关系。本句大意是“除非肯定会遭到严