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Beijing was attacked by such a terrible sandstorm ______few citizens had ever experienced before. 
#73251
A
and it was
B
as
C
that
D
which
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 _______was most important to her, she told me, was her family.
#71823
A
It
B
This
C
What
D
As
_____ is known to us all is that America is a developed country _____ the First World.
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A
Which; belonging to
B
as; belonging to　
C
what; belonging to
D
It; belonging to
Peter was so excited    he received an invitation from his friend to visit Chongqing.
#68318
A
where
B
that
C
when
D
why
You can take any seat _____is free .   
#72956
A
where
B
which
C
that
D
in which
Smell is to the nose_______ taste is to the tongue.
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A
that
B
why
C
how
D
what