单项选择题


Section A
In this section, you will hear five short conversations. Each conversation will be read only once. At the end of each conversation, there will be a twenty-second pause. During the pause, read the question and the three choices marked A, B and C, and decide which is the best answer. Then mark the corresponding letter on the answer sheet with a single line through the centre.
When will the letter of credit be opened

A. Within 10 working days from the date of the contract.
B. Within 20 working days from the date of the contract.
C. Within 30 working days from the date of the contract.