What really worries us is ______ the explorers can accurately locate themselves with the device in case of bad weather.
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A
that
B
where
C
what
D
whether
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As we know, big cities are good opportunities lie.
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A
what
B
the place which
C
where
D
in which
Our country ______ great changes in the last 30 years and it is no longer        it used to be.
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A
went through; what
B
went through; that
C
has experienced; that
D
has experienced; what
The question that puzzled them is ____ they can get rid of the air pollution in the area.
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A
how is it that
B
that how
C
that it is how
D
how it is that