The twins ____ a little Chinese from then on . A. could speak B. have been able to speak 选哪一个？
如题所述
为什么
追答有from then on(从那以后），用现在完成时态，而不是一般过去时态。
本回答被提问者采纳from then on 必须跟完成时吗
追答现在完成时，或一般过去时
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