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    精英家教网 > 高中英语 > 题目详情
    Don’t start reading a book ________ you find that it’s one you can read with ease and understanding.
    A．whenB．ifC．unlessD．though
    C
    根据句子句意和逻辑关系可知：请不要读书除非你觉得你读的书是简单易懂的，由此可知答案为unless，选后可复查，一般情况下unless与if…not意思相当，将if…not代入句子可知unless确实为正解。
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