Our Accounts Receivable Department has written to you three time

Our Accounts Receivable Department has written to you three times; _____, we have had no response to our letters.
A、consequently
B、moreover
C、thus
D、however
【正确答案】：D
【题目解析】：consequently意为”因此“；moreover意为”而且“；thus意为”因此“；however意为”然而“。句意：我们的应收账款部门已经给您写过三次信了；然而，我们的信一直没有回音。