A-A+
Before the age of the Internet we used to ___
问题详情
Before the age of the Internet, we used to ______ our holidays through travel agents.
A．book
B．having booked
C．booking
D．have booked请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A
解析：本题考查used to do这一结构。如果熟悉used to do这一结构，不难选出正确选项应为选项A。used to do意为“过去常常做……”。
