They set ___ making prparations for the party.RT介词

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They set ___ making prparations for the party.RT介词

They set ___ making prparations for the party.RT介词
They set ___ making prparations for the party.
RT
介词

They set ___ making prparations for the party.RT介词
to,set to 是开始认真干的意思,整句意思是他们开始为晚会做准备了