Had the company advertised overseas, it（ ）more competitive last

Had the company advertised overseas, it（ ）more competitive last year.
A、would be
B、would have been
C、was
D、should be
【正确答案】：B
【题目解析】：如果公司做了海外宣传，去年将会更有竞争力。
虚拟语气；表示对过去事实的假设，从句用had done，主句用would/should/might have done。