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 primitive weapon ______ from that country as it could not be traced back to any other origin.
A．must be introduced
B．must have been introduced
C．might be introduced
D．might have been introduced
单项选择题
She speaks as though she ______ on the spot.
A．was
B．were
C．had been
D．is
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