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6.You _____ have watered the flowers,for it's going to rain.(  )
A.needn'tB.shouldn'tC.couldn'tD.mustn't

分析 你不必给花浇水,因为要下雨了.

解答 答案是A.本题考查情态动词的辨析.needn't不必;shouldn't不应该;couldn't不能;mustn't禁止;根据句意,因为要下雨了,所以你"不必"给花浇水,故答案选择A.

点评 要在正确理解情态动词的基本含义的基础上,整体理解语境中的情感态度,做出合理的判断.

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