单项选择题
When using keyboard shortcuts, which keystroke combination allows users to erase a single word to the left of the cursor?（）
A. Ctrl + a B. Ctrl + e C. Ctrl + u D. Ctrl + w
单项选择题 When using keyboard shortcuts, which single keystroke combination allows users to erase the entire current command?（）
单项选择题 Which statement is correct regarding exception traffic processing?（）
多项选择题 What are two functions of the RE?（）
