单项选择题

You may keep the book a further week________no one else requires it.

A．lest
B．provided
C．unless
D．until
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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
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
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