单项选择题

You ______ all those calculations! We have a computer to do that sort of thing.

A．needn't have done
B．must not have done
C．shouldn't have done
D．can not have done

<上一题目录下一题>

热门试题

填空题

How many pieces of writing will you read if you have got Mr. Luo’s letter

填空题

让光标回到屏幕左上端 ( )取消一个指令