What did you do on your last week?这句话正确吗?介词on要不要加呢?

不对,要去掉on为什么首先，在一段时间前面不能用on,要用In或者during；如in the week ,in a month ,during the year在具体的某一天时用on,如 on Monday, 其次，last week 这种last + 时间的状语，通常无需加介词，直接使用即可如：I went to look for the dog last nightShe bought her a new cap last week