问题
Could you give me an explanation ______ your keeping silent throughout the discussion?-Oh, terribly sorryI had the least idea of what ________I would have made a complete foolofmyself if I had said anything[ ]
A: for; was discussed
B: of; had discussed
C: to; was being discussed
D: with; had been discussed
B: of; had discussed
C: to; was being discussed
D: with; had been discussed
正确答案是：
