The three backpackers finally reached the top of Mount Huangshan, ________ they could enjoy the breathtaking sights to their heart's content.
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A
when
B
where
C
why
D
how
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Gun control is the subject ________ Americans have argued for a long time.
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A
which
B
with which
C
about which
D
of which
The newly-built house, the walls _______ are painted light green, is really a peaceful place for us, especially after hard work.
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A
that
B
whose
C
of whom
D
of which
He wrote a letter ________ he explained what had happened in the accident.
#76030
A
what
B
which
C
where
D
as