单项选择题
A （ ） is a conditional written undertaking given by bank on the request of an importer to pay at sight or at determinable future date a certain amount of money to the exporter against stipulated documents. A、letter of creditB、telegraphic transferC、demand draftD、document against payment
单项选择题 The man would like to have _______.
单项选择题 【单选题】常绿树适宜( )移栽。
单项选择题 华南后汛期（7-9月）的主要天气系统（）
