单项选择题

______ coming here, I haven' t seen a single person.

A．Since
B．From
C．By
D．At
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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
单项选择题
Had I known the result, I ______ you to tell me.
A．would not ask
B．would not have asked
C．had not asked
D．have not asked
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