对once a week 提问用?

对once a week 提问用? 对once a week提问用什么 she eats junk food once a week.对once提问? I eat junk food once a week.对once提问 We have a piano lesson once a week.(对once a week提问） Grace goes to the library once a week.对once a week提问, My father shops once a week对once a week提问 Tom studies English once a week,对once a week提问 怎么写 She goes to see her grandpa once a week.(对once a week部分提问) We watch TV once a week(对 once a week提问) I visit my grandparents once a week对once a week提问,怎样写 She goes shopping once a week对once a week提问