单项选择题

It has been proved that it ______ to invest more in education and science research projects.

A．pays
B．costs
C．takes
D．gets
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单项选择题
The most fundamental principle in the reform of state organs is that they must ______ the masses of the people.
A．lend aid to
B．lend a hand to
C．keep pace with
D．keep in contact with
单项选择题
The young nurse tried her best to ______ the wounded and their sick day and night.
A．see to
B．take to
C．care for
D．attend to
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