We regret our inability to entertain your request that our L/C__

We regret our inability to entertain your request that our L/C__________confirmed by a local bank in your city.
A、being
B、be
C、has been
D、should have
【正确答案】：B
【题目解析】：request 从句中应该使用虚拟语气，should+动词原形，should可以省略，题中就是省略了should的情况，因此选择B选项。