I felt surprised that anyone of his intelligence such an easy test.
A. might have failed
B. could have failed
C. should have failed
D. must have failed
网友回答
A. might have failed
B. could have failed
(答案→)C. should have failed
D. must have failed
解析:C should表示竟然,句义:我感到很惊讶,依他的智商竟然没有通过这次非常容易的考试。