Most of the credits used in international trade are ______, i. e. credits that require shipping documents to be presented together with the draft.
A、clean credits
B、documentary credits
C、revocable credits
D、unconfirmed credits
【正确答案】：B
【题目解析】：Most of the credits used in international trade are documentary credits, i. e. credits that require shipping documents to be presented together with the draft.参见教材P164。