单项选择题

A．Its private airline service.
B．Being an American Post Office.
C．Its transporting small packages.
D．The low cost of its service.
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单项选择题
A．Her kids will arrive home after school.B．She is too exhausted to work.C．She has Finished her work.D．The man does not ask her to go back to the office.
A．Her kids will arrive home after school.
B．She is too exhausted to work.
C．She has Finished her work.
D．The man does not ask her to go back to the office.
填空题
The first man-made shelters could be easily ______.
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