（ ） maintain the six percent annual increase after 2017, the fed

（ ） maintain the six percent annual increase after 2017, the federal contribution would be richer by $36 billion.
A、If it is to
B、Were it to
C、Be it to
D、To
【正确答案】：B
【题目解析】：were-型虚拟语气。在表达假设的从属分句里经常用were，本句意为如果不是为了保持2017年后的6%的年增长，联邦贡献会更多而达到360亿。