单项选择题

________from other countries can't work in the United States without a permit.

A．Emigrants
B．Immigrants
C．Migrants
D．Civilians
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单项选择题
________your letter, I am pleased to inform you that you are to receive the order by the end of this week.
A．With regard to
B．Thanks to
C．So long as
D．As far as
单项选择题
Professor Smith________in this famous university for tbree decades by next winter.
A．will work
B．has worked
C．has been working
D．will have workcd
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