---Tracy, you look down．What’s up?-I have failed in the exam．---You _________ too much time on Korean TV series．A.needn’t have spentB.mustn’t have spentC.shouldn’t have spentD.wouldn’t have spent
网友回答
C解析A项的意思是“本来没有必要做某事”；B项形式错；C项的意思是“本来不应该做某事，而实际上已做了”；D项的意思是“本来不会做某事”。