单项选择题

Three - fourths of the suffrage of the earth ______ sea.

A．are
B．were
C．is
D．has been
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单项选择题
She is a very ______ secretary: She never forgets anything or makes a mistake.
A．anxious
B．effective
C．adequate
D．efficient
单项选择题
He likes dancing, skating and ______.
A．to swim
B．swims
C．swimming
D．goes to swim
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