单选题 This is a detailed handbook that provides all relevant information and will be a reference for ______ novice and skilled users of the new system.

【正确答案】 D

【答案解析】[解析] 语法：同位接续词
1．本题考查同位接续词，空格内须填入一个与空格后and相搭配的副词，D．both为正确选项。
2．neither A nor B，either A or B，not only A but also B等常在考题中出现，需熟练掌握。