Only after he realized the significance of mastering two languages __________ English carefully.
A．did he set about learningB．did he set out learning
C．had he set about learningD．had he set out learning
A
考查倒裝句,當only謂語句首時,主句部分采用部分倒裝.句意,只有他認識到掌握兩種語言的重要性后,他才開始認真學英語.set about doing sth開始做某事; set out出發(fā);開始,后接不定式.故選A.
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