Speaker A:If I were you,I would have accepted the job.
Speaker B:I turned down the offer because it would mean frequent business trips away from my family.
答案：选 A
解析：
1）由于Speaker B 没有接受the job,于是 Speaker A用条件虚拟语气提出一个委婉的建议；
2）Speaker B 应该针对对方的委婉建议给出理由作答,以下是选项分析：
A.I turned down the offer because it would mean frequent business trips away from my family.因为那将意味着离家频繁出差,我就拒绝了（他们）提供（给我的工作）.
—— 告诉对方自己拒绝的理由,合情合理.
B.Well,maybe I can recommend you to that company if you like.那好吧,如果你愿意,我可以推荐你去那家公司.
—— 狗咬吕洞宾的回答势必有负于对方的好心建议.
C.You should have told me earlier it was a good job offer.（早知道）向我提供的是一件好工作,你怎么就不早告诉我呢.
—— 对方的建议中并没有提到那件工作的好坏.
D.But I don't think I am qualified for that demanding job.但是我认为我不适于从事那项费力不讨好的工作.
—— 对方的建议中也没有提到那件工作是 demanding（过分要求的、苛求的）.