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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单项选择题
I don't want to lend any more money to Tom; he's already in debt ______ me.
A. to
B. of
C. for
D. with
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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