单项选择题

It is absolutely ______ that our class will win the game.

A．sure
B．exact
C．right
D．certain
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单项选择题
He was ______ of having asked such a silly question.
A．tired
B．fond
C．ashamed
D．miserable
单项选择题
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
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