It is surprising that he ________ have been so foolish．
A.must
B.could
C.should
D.might
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C解析should在It's surprising/strange/a pity…以及I'm surprised/sorry…等句型中，当“竟然会”讲。如：It's surprising that you should be so foolish．真令人吃惊，你竟会如此愚蠢！而must have been, could have been和might have been都是表示对过去某一情况不同程度的推测。