_______he was laid off last year ______ how serious the economic crisis was.
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A
Not until…he realized
B
It was not until… when he realized
C
It is not until…that did he realize
D
It was not until …that he realized
推荐题目
Jack, ______ to be here at 8 o’clock.
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A
is sure
B
is sure that
C
will be sure
D
be sure
 In the exam , the__________ you are, the__________ mistakes you’ll make. 
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A
carefully; little
B
more carefully, fewer
C
more careful; fewer
D
more careful; less
 I don’t remember how many years ago ____ I last showed you around the old campus.
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A
it was that
B
was it that
C
it was which
D
was it when
  Until the present century, ________ demand for natural gas.
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A
little
B
and little
C
there was little
D
was there little