单项选择题

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

A. I knew
B. did I know
C. I know
D. do I know

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The human body is composed of organs, each （） a definite job to do.

A. has
B. having
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There was no point （） out until the storm had really stopped.

A. in going
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C. of going
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