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
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题目内容：
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
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