单项选择题

You have to be ______ when you try to work out mathematical formulas.

A．reasonable
B．rational
C．logical
D．sound
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单项选择题
That politician's behavior was ______ as to cause widespread condemnations all over the world.
A．so
B．that
C．such
D．this
单项选择题
She regretted ______ up the plan; otherwise, she would have made it.
A．given
B．to give
C．to have given
D．having given
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