It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
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A
which
B
what
C
who
D
that
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It was only after he had read the papers Mr. Gross realized the task Before him was extremely difficult to complete.
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A
when
B
that
C
which
D
What
—Was it by cutting down staff ________ she saved the firm?—No，it was by improving work efficiency. (2012·上海，37)
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A
when
B
what
C
how
D
that
—_____bargaining is so interesting?—Sometimes it is a test to see who stand their ground for the longest.
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A
What is it that
B
Why is it that
C
What it is that
D
Why it is that
It is only with the help of scientific research _____ bring PM1 air pollution under control.
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A
that we will
B
we will
C
that we do
D
do we
It was at 5 o’clock __________ the visitors finally arrived at Pudong International Airport.
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A
when
B
that
C
before
D
after