Unfortunately, we can't send you immediately a full range of sam

Unfortunately, we can't send you immediately a full range of samples ________.
A、without payment
B、free of payment
C、without charge
D、free of charge
【正确答案】：D
【题目解析】：【考点点击】本题主要考查的知识点为为客户 免费提供样品（free of charge)的表达。【要点透析】free of charge表示“免费”，是固定 词组。