单项选择题

His success was due to ______ he had been working hard.

A．that
B．the fact which
C．the fact that
D．the fact of
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单项选择题
When someone is ______ ,he does not always feel ______.
A．lonely, alone
B．alone, lonely
C．lonely, lonely
D．alone, alone
单项选择题
The United States is composed of 50 states , two of which are separated from ______ by land or water.
A．others
B．other one
C．the others
D．another
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