Only after he realized the significance of mastering two languages __________ English carefully...
Onlyafterherealizedthesignificanceofmasteringtwolanguages__________Englishcarefully.A...
Only after he realized the significance of mastering two languages __________ English carefully. A．did he set about learning B．did he set out learning C．had he set about learning D．had he set out learning
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| A |
| 考查倒装句,当only谓语句首时,主句部分采用部分倒装.句意,只有他认识到掌握两种语言的重要性后,他才开始认真学英语.set about doing sth开始做某事; set out出发;开始,后接不定式.故选A. |
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