问题
选择题
The train was ten minutes late , so I _______ have run all the way from my house to the station.
A．couldn’t
B．shouldn’t
C．needn’t
D．mustn’t
答案
答案：C
搜题请搜索小程序“爱下问搜题”
The train was ten minutes late , so I _______ have run all the way from my house to the station.
A．couldn’t
B．shouldn’t
C．needn’t
D．mustn’t
答案：C
则f’(0)=______。