_____you have to do the job, you should try your best to do it well  even though it may be very difficult for you.
A．SinceB．WhileC．UnlessD．Though
A

試題分析：A.Since既然       B. While當…時候    C. Unless 除非  D. Though盡管；句意：既然你必須做這份工作，你就應該盡最大的努力把它做好，即使對你來說很困難。故選A
點評：此題考查連詞的表面意思，并不難。對于此類連詞詞義辨析的題目，首先應著眼于句意的理解，在理解句意的基礎上結合四個選項的意思，采用排除法，得出最符合題意的一項答案。在平時的學習中要勤積累，并掌握這些連詞的常用用法。
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