Not until he took off his sunglasses him.A. I recognizedB. I did recognizeC. did I recog

问题补充：

Not until he took off his sunglasses him.

A. I recognized

B. I did recognize

C. did I recognize

D. do I recognize

答案：

A. I recognized

B. I did recognize

(答案→)C. did I recognize

D. do I recognize

解析：考查倒装结构。. Not until放在句首要部分倒装，根据前面动词时态为过去式，所以选C.

句意：直到他摘下眼镜我才认出了他。