Not until some students failed in the exam how much time they had wasted.A. didn’t they r

问题补充：

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：

A. didn’t they realize

(答案→)B. did they realize

C. they didn’t realize

D. they realize

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