问题
选择题
Not until some students failed in the exam _____ how much time they had wasted.
A．didn’t they realize
B．did they realize
C．they didn’t realize
D．they realize
答案
答案：B
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Not until some students failed in the exam _____ how much time they had wasted.
A．didn’t they realize
B．did they realize
C．they didn’t realize
D．they realize
答案：B