This interesting book only me ten yuan and I ten month reading it.
A. cost, spend
B. cost, spent
C. spends, cost
D. spent, costs
网友回答
A. cost, spend
(答案→)B. cost, spent
C. spends, cost
D. spent, costs
解析：spend主语通常为人表示花费的意思，故不选CD，本题表示的是过去用过去时态，cost的过去式是cost，spend的过去式是spent，故本题选B。