The traveler lost his way in the woods, and ________made things worse was that it was getting dark.
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A
that
B
what
C
which
D
as
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Although he was in poor health, Robert succeeded ______ other more famous engineers failed.
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A
which
B
that
C
what
D
where
There is a new problem involved in the popularity of private cars _______ road conditions need _______.
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A
that; to be improved
B
which; to be improved
C
where; improving
D
when; improving
British scientists have produced _____ they believe is the world’s smallest Christmas card．
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A
which
B
who
C
that
D
what
The reform has changed the whole nation. It cannot remain _________ it used to be.
#72092
A
what
B
where
C
which
D
when