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 你絕對(duì)不能在太陽(yáng)底下看書---那樣將對(duì)你的眼睛有害．

解答 答案：D
A．couldn't不能；  B．wouldn't 不會(huì)；  C．needn't 不需要； D．mustn't 絕對(duì)不能，禁止；根據(jù)句意可知，因?yàn)樵谔?yáng)底下看書將對(duì)眼睛有害，所以這里表示的應(yīng)是"絕對(duì)不能，禁止"的意思；故選D

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的否定形式的用法；做類似的題時(shí)，首先需要熟練掌握各情態(tài)動(dòng)詞所表達(dá)的意義及它們之間的用法區(qū)別；然后選出符合句意的選項(xiàng)．

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