单项选择题

More than once ______us by now to adhere to the rules and disciplines of our university.

A．has our teacher told
B．our teacher has told us
C．did our teacher tell
D．our teacher told
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单项选择题
They stayed up late trying to ______out a way to solve the problem.
A．let
B．give
C．knock
D．figure
单项选择题
It is not the first time that I ______by him during my cooperation with him.
A．was cheated
B．am cheated
C．have been cheated
D．had been cheated
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