单项选择题

A．forms
B．existence
C．contents
D．purpose
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单项选择题
A．offeringB．offeredC．which offeredD．to be offered
A．offering
B．offered
C．which offered
D．to be offered
单项选择题
A．onB．throughC．withD．of
A．on
B．through
C．with
D．of
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