(2013·沈阳重点中学协作体高三预测)I just wonder ________ that makes him so excited.
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A
why it is
B
what is it
C
how it is
D
what it is
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It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.
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A
that
B
what
C
which
D
where
After ten years, she changed a lot and looked different from _______ she used to be.
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A
that
B
whom
C
what
D
who
Afghans used to hold big weddings, costing thousands of dollars, in a county _____ the average annual income is less than $400.
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A
which
B
whose
C
where
D
what
As long as the laws of nature ______, there will be tornadoes.
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A
exist
B
are existing
C
will exist
D
existed