【题目】I'm certain David's told you his business troubles. __________，it's no secret that he owes a lot of money to the bank.
A. However B. Anyway C. Therefore D. Though
在线课程【答案】B
【解析】however 然而；anyway 不管怎样；therefore因此；though虽然。句意：……不管怎样，他欠银行很多钱已不是秘密了。