Gun control is a subject _____ American have argued for a long time.
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A
of which
B
with which
C
about which
D
into which
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This is the hotel ________ last month. 
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A
which they stayed
B
at that they stayed
C
where they stayed at
D
where they stayed
Our teacher lives in a poorly decorated apartment, ______ the south.
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A
that window opens
B
the window of which opens to
C
whose window open to
D
the window of it opens to