题目内容：
键盘上，单独使用时不起作用的键是（ ）。
A．Num Lock B．Shift
C．Caps Lock
D．Backspace
参考答案：
答案解析：
单选题：键盘上，单独使用时不起作用的键是（ ）。
- 题目分类：会计电算化
- 题目类型：单选题
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B．Shift
C．Caps Lock
D．Backspace
B．Shift
C．Caps Lock
D．Backspace
A are causedB caused C are to causeD have been causing
A are causedB caused C are to causeD have been causing
Which of the following can be best inferred from the passage
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根据以上短文和选项，回答题Paragraph 2__________
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使用“剪切”、“复制”和“粘贴”命令只能在同一个文档中进行选定对象的移动和复制。（ ）
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