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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单项选择题
The man in the comer confessed to ______ a lie to the manager of the company.
A．have told
B．having been told
C．being told
D．having told
单项选择题
He will come to call on you the moment he ______ his work.
A．will finish
B．finishes
C．finish
D．shall finish
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