Then moment _________ Mary will always remember is _________ Mr. Black gave her a lot of valuable advice on how to improve her writing.
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A
when; that
B
that; that
C
that; when
D
when; where
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The old town has narrow streets and small houses ________ are built close to each other.
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A
they
B
where
C
what
D
that
In 2009 many countries are going through financial crisis，________has a great effect on many walks of life.
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A
it
B
which
C
that
D
what
Do you remember the chicken farm _____ we visited three months ago?
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A
where
B
when
C
that
D
what
Copernicus’s theory is now the basis ______ all our ideas of the universe are built.
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A
to which
B
on which
C
for which
D
by which