单项选择题


A．tries to cover
B．manages to cover
C．fails to cover
D．succeeds in
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单项选择题
A．byB．withC．atD．about
A．by
B．with
C．at
D．about
单项选择题
A．informB．be informedC．to be informedD．informed
A．inform
B．be informed
C．to be informed
D．informed
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