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12.You _____ tell him.He is fully aware of the danger.(  )
A.mustn'tB.don't needC.needn'tD.can't

分析 你不必要告诉他,他已经完全意识到危险了.

解答 答案:C
根据回答句"He is fully aware of the danger"可知,"他已经完全意识到危险了",所以你没有必要告诉他,"needn't"符合题意."mustn't"意为"禁止,千万不要","can't"意为"不能".

点评 本题考查情态动词.考生在答题时需结合具体语境,做出判断.

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