单项选择题

A ______ of the long report by the budget committee was submitted to the mayor for approval.

A．shorthand
B．scheme
C．schedule
D．sketch
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单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
单项选择题
______ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.
A．Even
B．But
C．Although
D．So
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