by the time he got to school,he realized that he __his homework at home

问题描述:

by the time he got to school,he realized that he __his homework at home
A.had forgotten B.had left

B left sth.at home 这个是固定短语forget也可表遗留啊把什么忘在家里的固定表达就是这个,就好像树是tree一样没有原因。forget是干扰项 满意请采纳,谢谢