His failure suggested that he the teacher’s suggestions．
A. can’t have followed
B. needn’t follow
C. mustn’t have followed
D. shouldn’t follow
网友回答
(答案→)A. can’t have followed
B. needn’t follow
C. mustn’t have followed
D. shouldn’t follow
解析：句意：他的失败表明了他不可能听了老师的建议。can’t have done不可能做了某事；must表推测不能用于否定句；因为现在已经失败，所以这是对过去的推测，过去没有听从老师的建议。故选A。