问题补充：
He can’t the difference between right and wrong.
A. say
B. speak
C. answer
D. tell
答案：
A. say
B. speak
C. answer
(答案→)D. tell
解析：A.说话B.讲C.回答；句意：他不能分辨出对和错的差异。固定词组tell the difference between A and B“说出A和B的不同之处”。此处tell意为“辨别，判断”。故选D.
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