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
考查連詞的用法。意為不要開始讀一本書，除非你發(fā)現(xiàn)那是一本你可以輕松地讀下去，并且可以理解的樹。
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