Mark Twain worked for several years as a pilot on a steamboat, taking passengers up anddown the Mississippi, the great river ___flows from the north of the US near the Canadianborder.
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A
as
B
what
C
which
D
who
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You are saying that everyone is equal, _____ is _____ I disagree.
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A
that; what
B
which; what
C
which; where
D
that; where
A turning point of the continuously high housing price won't appear suddenly because there must be a certain process _ many factors lead to the change．
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A
which
B
what
C
where
D
that
There is a system ________the waste is disposed of using the principles of ecology.
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A
which
B
where
C
that
D
at which
Being a Chinese, I feel proud of my country and the contributions _________have been made to the world culture.
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A
that
B
what
C
it
D
one