单项选择题

Paper money was in ______ use in China when Marco Polo visited the country in ______ thirteenth century.

A.the; /
B.the; the
C./; the
D./; /
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单项选择题
It’s quite obvious that the aging population in China will cause ______ heavy burden on ______ whole society in the future.
A./; a
B.a; the
C.the; a
D.a; /
单项选择题
______ Shenzhen you see today is quite ______ different city from what it used to be.
A.The; /
B./; the
C.The; a
D.A; the
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