听力原文：What is it called if a letter of credit is issued for guarantee of performance rather than payment?(3)A．Back-to-back credit.B．Reciprocal credit.C．Documentary credit.D．Stand-by credit.
题目
听力原文：What is it called if a letter of credit is issued for guarantee of performance rather than payment?
(3)
A．Back-to-back credit.
B．Reciprocal credit.
C．Documentary credit.
D．Stand-by credit.