A-A+
______for their help we would not have overco
问题详情
______for their help, we would not have overcome the difficulties.
A．Weren"t
B．Had it not been
C．Hadn"t it been
D．Had it been not
参考答案
正确答案：B
解析：本句为虚拟语气。当条件句中省略连词if可将were，had，should等提到主语之前。
考点：
