Only after I had known him for some time______to appreciate his real worth.A、do

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问题 Only after I had known him for some time______to appreciate his real worth.

选项 A、do I begin
B、did I begin
C、I began
D、had I begun

答案 B

解析当only+副词、介词短语或状语从句放在句首时。句子要进行倒装，即将句中的助动词提前，其余顺序不变。在本题中．only+after引导的时间状语从句被放在了句首，主句原来是一般过去时，其中的助动词应该为did，所以答案就是[B]did I begin。

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OnlyafterIhadknownhimforsometime______toappreciatehisrealworth.A、do