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

分析 你不必要告訴他，他已經(jīng)完全意識到危險了．

解答 答案：C
根據(jù)回答句"He is fully aware of the danger"可知，"他已經(jīng)完全意識到危險了"，所以你沒有必要告訴他，"needn't"符合題意．"mustn't"意為"禁止，千萬不要"，"can't"意為"不能"．

點評 本題考查情態(tài)動詞．考生在答題時需結(jié)合具體語境，做出判斷．

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