We are going to hold a Christmas partyat 19:00 （） 23 Dec. A: in B: on C: at D: over
We are going to hold a Christmas partyat 19:00 （） 23 Dec. A: in B: on C: at D: over
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We are going to hold a Christmas partyat 19:00 （） 23 Dec. A: in B: on C: at D: over