The word which can mean the phrase; "promise to come" as in the task content is; pledged presence.
Which word can mean the phrase; promise to come as in the task content?
It follows from the task content that a word is required to replace the phrase; promise to come as in the task content.
Since, the word pledged is a synonym of promise, it therefore follows from the task content that the word which may be used to replace the phrase is pledged.
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