--When did your toothache start?--_____.

--When did your toothache start?--_____. when did you start your homework When did you _____ your hair _____? When did it start? when did you start to______? When did you start skating? when did it start? 解释 When did you start out? When did the flood in your hometown____ _____(发生)? when did the frie start it started__the fire __in your class 是when did it started还是when did it start? 你的生日晚会什么时候开始?when _____ your birthday party start?答案；does 为什