You _____ read a book in the sun—it'll do harm to your eyes．                      
A．couldn'tB．wouldn'tC．needn'tD．mustn't
D
其他動詞辨析。A不可能；B不會；C不需要；D千萬不能，禁止；結合句意可知D正確。句意：你千萬不能再陽光下看書。它對你眼睛有很大的傷害。
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