单项选择题


A．aren't
B．weren't
C．isn't
D．wasn't
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单项选择题
The purpose of the passage is to discuss______.
A．migration between countries
B．the reasons of international migrants
C．migration inside the country
D．the problems of international migrants
单项选择题
A．sensesB．casesC．wordsD．means
A．senses
B．cases
C．words
D．means
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