单项选择题

According to the periodic table, ______ still some elements undiscovered.

A．there seem to be
B．it seems to be
C．it seems that
D．here seem
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单项选择题
A ______ change in policy is needed if relations are ever to improve.
A．strict
B．wide
C．ever
D．radical
单项选择题
Calculations, which are astronomically exact, have been made ______ with the use of computers.
A．possible
B．it possible
C．possibly
D．to be possible
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