一道英语从句的题; (4)I am ashamed,sir,that I wasted a lot of hours ___ I should have studied at school.A whileB asC onceD when
问题描述:
一道英语从句的题; (4)
I am ashamed,sir,that I wasted a lot of hours ___ I should have studied at school.
A while
B as
C once
D when
答