单选题 They had all stayed on the ninth floor of the Metropole Hotel in Hong Kong in ______ half of February,

【正确答案】 A

【答案解析】表示前一半或后一半要用序数词，序数词前加定冠词。选项A是正确的。[句子大意]二月份的后半个月他们全都住在香港的Metropole大酒店的第九层。