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What really worries us is ______ the explorers can accurately locate themselves with the device in case of bad weather.
#79509
A
that
B
where
C
what
D
whether
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Perseverance is a kind of quality --- and that’s ________ it takes to do anything well. 
#79415
A
why
B
that
C
which
D
what
We got lost in the forest and decided to remain _____ we were and waited for rescue.
#79475
A
how
B
what
C
where
D
who
—I drove to Zhuhai for the air show last week.—Is that__________you had a few days off?
#79394
A
why
B
what
C
when
D
where
______sounded unimaginable to everyone present was______ she had managed to finish   the task in a week.
#79396
A
What; how
B
It; how
C
It; that
D
What; that
(2014·安徽马鞍山两校第二次联考)China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.
#79324
A
because 
B
why
C
when 
D
how
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