银行卡行内交易风险控制，请款确认只能由（）发起。
A.发卡行
B.收单行
C.差错处理中心
D.发卡行和收单行均可
参考答案：A
Some men _____ down on the sand last summer.[ ]
A. lie
B. lay
C. lied
She felt very upset ___________ what her deskmate said.
A because B because of C as if D unless
