you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么

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you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么
you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么

you two keep guard at the door 和you two to keep gard at the door 哪个对 为什么
前者对
后者错 因为没有谓语