单项选择题


A．how
B．why
C．what
D．when
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单项选择题
A．rule offB．rule outC．rule overD．rule of
A．rule off
B．rule out
C．rule over
D．rule of
单项选择题
The bold word it refers to which of the following
A．Problem.
B．Material.
C．Difficulty,
D．System.
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