单项选择题

There was a traffic jam, but she ______ get to the destination in time.

A．could
B．might
C．ought to
D．was able to
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单项选择题
It is important to ______ between the rules of grammar and the conventions of written language.
A．determine
B．distinguish
C．identify
D．explore
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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