单项选择题

The value of our house soared, enabling us to ______ to a larger place.

A．trade down
B．trade on
C．trade in
D．trade up
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单项选择题
It's self-evident that no one would have time to know everything ______ going on in the world.
A．there is
B．as is
C．it is
D．what is
单项选择题
Merry is a woman of ______ who has never abandoned her principles for the sake of winning a vote.
A．honesty
B．reputation
C．integrity
D．notoriety
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