Only after I had talked to him for quite some time______to understand his worrie

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问题 Only after I had talked to him for quite some time______to understand his worries.

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

答案 B

解析我跟他交谈了一会儿后才开始明白他的焦虑。“only+状语”位于句首时，应该使用部分倒装结构。由状语从句中的过去完成时可知谓语动词应用过去时态，故本题的正确答案是B项。

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