题目内容

You _____ read a book in the sun—it'll do harm to your eyes．                      
A．couldn'tB．wouldn'tC．needn'tD．mustn't
D
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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