When he was at school, he ______ early and take a walk before br

When he was at school, he ______ early and take a walk before breakfast.
A、will rise
B、shall rise
C、should rise
D、would rise
【正确答案】：D
【题目解析】：when 引导的时间状语从句，前后时态要保持一致，从句”when he was at school " 为一般过去式，因此主句要使用过去式，would rise。