33．Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set．
| A．did he begin | B．he began | C．he did begin | D．began he |
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33．Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set．
| A．did he begin | B．he began | C．he did begin | D．began he |
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