问题补充：
—He failed in the exam again.
—He his teacher’s advice.
A. should not have followed
B. should not follow
C. mustn’t follow
D. should have followed
答案：
A. should not have followed
B. should not follow
C. mustn’t follow
(答案→)D. should have followed
解析：考查虚拟语气。句意：他在考试中又不及格。——他应该听从老师的忠告。Should have表示过去该做而没做的动作，故选D。
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