阿片类镇痛药的使用取决于（）
A.疼痛的强度
B.疼痛的持续时间
C.疼痛的部位
D.疾病类型
参考答案：A
—If I don't get some money from my parents by Friday, could I borrow some from you?
—_______. But can I know why?[ ]
A. Never mind
B. Not at all
C. By no means
D. By all means
