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 |
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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 |
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