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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
根據(jù)句子句意和邏輯關系可知：請不要讀書除非你覺得你讀的書是簡單易懂的，由此可知答案為unless，選后可復查，一般情況下unless與if…not意思相當，將if…not代入句子可知unless確實為正解。
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