when is your art lesson?a at 10o 'clock b it's half past ten

A 问的是时间what time后只能加at 10o 'clock吗？我认为b也挺详细啊B是问几点的，what is the time now 。问题问的是什么时候。b 是七点半啊用选项替换when 试试。your art lesson is .。。。另一句话what time is it nowit is half past ten。这里就用B了，带入试试。