Gun control is a subject ________Americans have argued for a long time,
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A
of which
B
with which
C
into which
D
about which
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This is the biggest lab__________we have ever built in our university.
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A
which
B
what
C
that
D
Where
In 2009 many countries are going through financial crisis，________has a great effect on many walks of life.
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A
it
B
which
C
that
D
what
I have the same opinion as yours _____ we should carry out the experiment at once.
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A
that
B
which
C
whether
D
where
In the cafeteria, I saw my sister and her three friends, none of ____ I had ever seen before.
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A
them
B
which
C
whom
D
those
That’s the new machine ________ parts are too small to be seen.（ ）
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A
that
B
which
C
whose
D
What