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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Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
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A
when
B
that
C
after
D
since
After his wife was killed in the earthquake, it was his daughter _____ managed the house and accompanied him
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A
whom
B
that
C
which
D
what
It was not until near the end of the letter ______ she mentioned her own plan.
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A
where
B
that
C
why
D
when
It’s one’s bad habits, rather than a certain natural disaster, one’s longevity (长寿)for most of the time.
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A
that affects
B
which affect
C
which affects
D
that affect
It was back home after the experiment.
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A
not until midnight did he go
B
until midnight that he didn’t go
C
not until midnight that he went
D
until midnight when he didn’t go