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
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
问题解答:
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