单项选择题
We must observe the local ______ of various nationalities.
A．customs
B．rules
C．habits
D．manners
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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
All ______ is a continous supply of the basic necessities of life.
A．what is needed
B．for our needs
C．the thing needed
D．that is needed
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