“月下编席”是孙犁哪部小说的开头情节（）
参考答案：《荷花淀》
He _____ play the piano since he was young. He is very famous now.
A．has could
B．has been able to
C．could
D．was able to
塑料模常用的材料有哪些类型？举出2～3个钢的脾号.
