门窗过梁常见的形式有（）。
A、砖拱过梁
B、压型钢板过梁
C、木过梁
D、钢筋砖过梁
E、钢筋混凝土过梁
参考答案：A, D, E
That's my sister. ______________ is a teacher. [ ]
A. She
B. I
C. He
After her son’s death, the old lady __________ sit at the window, deep in thought.
A．would
B．should
C．could
D．might
