But if a deal were struck it too could prove momentous, this time as a chance to redefine how big online platforms are run.
as a chance...为介词短语作补充语supplement,对主语it ( = a deal) 作补充说明。例如下句:
He came back to the company again, this time as the co-manager.
他又回到了该公司,这次是以副经理的身份。
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