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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

解析其他动词辨析。A不可能;B不会;C不需要;D千万不能,禁止;结合句意可知D正确。句意:你千万不能再阳光下看书。它对你眼睛有很大的伤害。

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