So little ______ about mathematics that the lecture was completely beyond me.A、I

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问题 So little ______ about mathematics that the lecture was completely beyond me.

选项 A、I knew
B、do I know
C、did I know
D、have I known

答案 C

解析 little是具有否定意义的词，放在句首时句子倒装。注意时态一致的问题，所以本题选C。

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