初中英语题一道(请说明理由)

题目

初中英语题一道(请说明理由)
I don't know ( )tomorrow.Can you tell me?
A、when we started
B、when did we start
C、when we will start
D、when will we start

答案

根据时间状语,排除AB
该句为宾语从句,从句中用陈述句的语序,所以选C