单项选择题

She is the ______ holder of the 3,000-meter world record, but there is no guarantee that she will win in the Olympic Games.

[A] current
[B] predominant
[C] prevailing
[D] prevalent
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单项选择题
A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.
[A] calls for
[B] calls on
[C] calls up
[D] calls forth
单项选择题
A committee of four men and three women ______ to consider the matter.
[A] are
[B] is
[C] were
[D] be
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