Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có lời giải chi tiết (Đề 4)

So little ________ about mathematics that the lecture was completely beyond me. A. I have known B. I knew C. do I know D. did I know

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

I have known

I knew

do I know

did I know

Giải thích

Chọn D