That's an Advent Weekday. The propers would be that of the Second Sunday in Advent, except the Alleluia, which would be Qui sequitur me, according to dvalerio's index of the Graduale Triplex.
Joseph Mendes is right, although for English propers you have to decide if you want the Missal propers (which are proper to each day) or the Graduale ones (which, as Joseph mentions, are the Sunday ones with the exception of the Alleluia verse.)
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