It might have been _____ who made the bid.

It might have been _____ who made the bid.
A、himself
B、his
C、him
D、he
【正确答案】：D
【题目解析】：it might have been... who...是强调句结构的变形；might have been意为“可能是”；去掉强调句结构句子就成为... made the bid，句中缺少主语，选项中能做主语的只有D。