单项选择题

A．forms
B．existence
C．contents
D．purpose
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单项选择题
A．HoweverB．AndC．ThereforeD．So
A．However
B．And
C．Therefore
D．So
单项选择题
A．offeringB．offeredC．which offeredD．to be offered
A．offering
B．offered
C．which offered
D．to be offered
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