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In the final exam of last term, our maths teacher Mr.Wu gave us  ________we all couldn’t work out .
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A
such a difficult problem that
B
so a difficult problem as
C
so difficult a problem that
D
as difficult a problem as
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The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.
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that
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what
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how
D
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