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
Writing is a slow process, requiring ______ thought, time, and effort.
A．significant
B．enormous
C．considerable
D．numerous
单项选择题
I saw a traffic ______ this morning.
A．accident
B．event
C．conflict
D．damage
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