_____ your decision to place regular orders with us, we request

_____ your decision to place regular orders with us, we request that you furnish us with two references for the initial purchase.
A、While appreciating
B、As appreciating
C、When appreciate
D、Because we appreciate
【正确答案】：A
【题目解析】：句意：虽然感谢您决定定期向我们下订单，但我们要求您为我们的首次采购提供两份参考资料。while在这里意为”然而“。由于appreciate与we之间是主动关系，所以用现在分词，故可排除选项C和D；as意为”正如“，不符句意。