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China began to open to the outside world in the late 1970s. _________, there have been great changes in the country.                  
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A
By then
B
As a result
C
At last
D
In all
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on
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next to
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because
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because of
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A
in; on
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at; in
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at; at
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A
for
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of
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an, in
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a, on
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A
at
B
to
C
on
D
for