单选题 At the last place Gary worked, they ______ an annual company picnic. All the employees ______ bring their families along and spend the day at a nearby park. It was great.

A、 had to have; had to
B、 used to have; couldn't
C、 would have; didn't have to
D、 used to have; would

【正确答案】 D

【答案解析】句意：Gary以前工作的地方，每年公司都会有一次野餐，所有的员工都会带上家人一起在附近的公园玩上一天，那太棒了。used to do和would do都表示过去经常和习惯性的动作，从annual可以推知他们是经常做的事，因而D选项正确。