When did the custom of dueling begin
举一反三
- When did the custom begin？ The custom began in （）.
- I’d like to know ________ Chinese. A: when he began to learn B: when did he begin to learn C: when did he begin learning D: when did he began learning
- When did England begin to be Christianized?
- When did the hunter-gatherer lifestyle begin to change?
- When did Hitler begin an invasion of the... declaration of war?