It was only after he had read the papers ________ Mr.Gross realized the task before him was extremely difficult to complete.                             (2013·大纲全国,30)
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A
when
B
that
C
which
D
what
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Whether you believe it or not, it was________ caused the serious accident.
#84762
A
because of your carelessness that
B
because you were careless
C
you were careless that
D
your being carelessness that