You          read a book in the sun—it’ll do harm to your eyes.
A.couldn’t B.wouldn’t C.needn’t D.mustn’t
D
本題考查情態(tài)動(dòng)詞。句中mustn’t表示“禁止”之意。句意:禁止在陽(yáng)光下讀書——會(huì)對(duì)你的眼睛有害的。
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