—Did you have fun _____________ on your last day off?
—No, I didn't. there were too many people and it was really crowded.
A：shop
B：shopping
C：to shop
D：shopped
方程 x2 = 3x的根是 （ ）
— No, not at all.
西藏军区总医院院长李素芝，36年坚守雪域高原，攻克了先天性心脏病和高原病两大难题，深受西藏军民爱戴。他说：“我从不后悔我的选择。因为，能有力量为人民服务，这是最大的幸福!”对此理解不正确的是（ ）
