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David has to admit the fact ________ he has fallen behind the others in his class.
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whether
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that
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why
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when
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I was about to go to bed _____ someone knocked at the door.
#71475
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when
B
then
C
at the time
D
and
Students shouldn’t be given so difficult a problem ______they can not work out.
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A
that
B
which
C
while
D
as
I hold the view ______ she stated was true.
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A
that
B
what
C
that what
D
which
Here is such a difficult text _____ none of us can understand. Here is such a difficult text _____ none of us can understand it. 
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A
as
B
which
C
that
D
where
A Chinese immigrant ______ neighbours said struggled to survive in America was arrestedSunday because he used a butcher knife to kill his relatives.
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A
whose
B
which
C
whom
D
who