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 你絕對不能在太陽底下看書---那樣將對你的眼睛有害．

解答 答案：D
A．couldn't不能；  B．wouldn't 不會；  C．needn't 不需要； D．mustn't 絕對不能，禁止；根據(jù)句意可知，因為在太陽底下看書將對眼睛有害，所以這里表示的應(yīng)是"絕對不能，禁止"的意思；故選D

點評 本題考查了情態(tài)動詞的否定形式的用法；做類似的題時，首先需要熟練掌握各情態(tài)動詞所表達(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．

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