Tsinghua University, ______ in 1911, is home a great number of outstanding figures.
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A
found
B
founding
C
founded
D
to be founded
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The two friends ______on the Internet for three hours, and they would go on till the next morning.
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A
have been chatting
B
had been chatting
C
were chatting
D
had chatted
The country life he was used to________greatly since 2002.
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A
change
B
has changed
C
changing
D
have changed