During the past 120 years, the world        three waves of global economic integration(联合).
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A
witnessed
B
witnesses
C
has witnessed
D
will witness
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 The pen I____ I _____is on my desk, right under my nose.
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A
think; lost
B
thought; had lost
C
think; had lost
D
thought; have lost
 It was the third time that I ________ of the changes of the timetable.
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A
had informed
B
have informed
C
had been informed
D
have been informed