单项选择题

A．by
B．with
C．at
D．about
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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
单项选择题
A．sourceB．originC．courseD．finance
A．source
B．origin
C．course
D．finance
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