图a所示刚架，取图b所示的基本结构，力法典型方程可写为：δ₁₁X₁+△1_c=△₁，其中△₁应为（）。

A．(0

B．(＜0

C．(＞0

D．(不能确定

You can't help wondering how much he has changed. He is not what he _____. 　　[ ]

A. would be 　　　　　　　　　

B. used to be 　　

C. was used to be 　　　　　　

D. was used to being