单项选择题

Abraham Lincoln insisted that ______ not just on mere opinion but on moral purpose.

A．to base democracy
B．democracy be based
C．for democracy to be based on
D．whenever democracy is based
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单项选择题
He might have been killed ______ the arrival of the police.
A．except for
B．but for
C．with
D．for
单项选择题
Dozens of scientific groups all over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules.
A．pursuing
B．chasing
C．reaching
D．winning
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