单选题 They were ______ for a honeymoon after their wedding ceremony.
A. off B. down C. in D. up

【正确答案】 A
【答案解析】[解析] 他们在婚礼之后动身去度蜜月。
[考点] 词义辨析
[解析] be off意为“动身，离开”。