单项选择题

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

A. I knew
B. do I know
C. did I know
D. have I known
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From the way you are talking I can only ______ the conclusion that you are not the slightest bit interested in the project.
A. draw
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The engine is ______ at 6,000 revolutions per minute.
A. turning in
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