单项选择题

I regretted ______the expensive air-conditioner.

A．not to afford
B．not affording
C．not being able to afford
D．I can't afford
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单项选择题
It must have rained yesterday evening, ______ the ground is wet.
A．since
B．while
C．for
D．because
单项选择题
Our system of justice takes it for granted that a man is innocent until ______.
A．proves guilty
B．to prove guilty
C．proven guilty
D．proving guilty
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