Last month I __________ 2,000 yuan from my sister and yesterday I __________ it _________.
A.borrowed；paid；offB.lent；paid；forC.took；paid；backD.spent；paid；of在线课程A
解析：
borrow指主语往自己手中借钱；
pay back表示“还钱”为固定的动词短语.这句意思是“上个月我向姐姐借了2,000元钱，昨天我还给她了”，答案为A.