单项选择题

() a good beginning is made, the work is half done.

A. As soon as
B. While
C. As
D. Once

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There is no （） to the house from the main road.

A. access
B. avenue
C. exposure
D. edge
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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