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11.You          read a book in the sun---it'll do harm to your eyes.(  )
A.couldn'tB.wouldn'tC.needn'tD.mustn't

分析 你绝对不能在太阳底下看书---那样将对你的眼睛有害.

解答 答案:D
A.couldn't不能;  B.wouldn't 不会;  C.needn't 不需要; D.mustn't 绝对不能,禁止;根据句意可知,因为在太阳底下看书将对眼睛有害,所以这里表示的应是"绝对不能,禁止"的意思;故选D

点评 本题考查了情态动词的否定形式的用法;做类似的题时,首先需要熟练掌握各情态动词所表达的意义及它们之间的用法区别;然后选出符合句意的选项.

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