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They promised to develop a software package by the end of this year, ________ they might have.
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A
however difficult
B
how difficult
C
whatever difficulty
D
what difficulty
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It was raining on the day_______ they arrived.
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A
in which
B
on that
C
on which
D
where
(2013·四川南充市一模)My favorite writer is Mo Yan, some of ________ novels have a surprising ending.
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A
whom
B
his
C
whose
D
which
 It is such a modern machine ______ few of the workers know how to operate.
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A
as
B
which
C
that
D
the one
It makes little difference to me _____ we go or stay．
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A
whether
B
where
C
that
D
how
The time is not far away______modern communications will become widespread in China’s vast countryside.
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A
as
B
until
C
before
D
when