单项选择题

A．reason
B．cause
C．problem
D．purpose
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单项选择题
A．formsB．existenceC．contentsD．purpose
A．forms
B．existence
C．contents
D．purpose
单项选择题
A．tries to coverB．manages to coverC．fails to coverD．succeeds in
A．tries to cover
B．manages to cover
C．fails to cover
D．succeeds in
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