We wish to inform you that all the items ordered are available from stock and will be shipped upon receipt of your letter of credit．
【正确答案】
A
【答案解析】本题的解题关键在于正确把握inform的意思，短语upon receipt of的译法，分清人称代词We，you和your所对应的词。inform意为“通知，告知”，短语upon receipt of可以译成“一收到……就……”。