单项选择题

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

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

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单项选择题

（）coming here, I haven’t seen a single person.

A. Since
B. From
C. By
D. At

单项选择题

How many unnecessary copies they have made（）

A.Five.
B.Four.
C.Six.
D.Seven.

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