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_____ you make a promise, you should keep it.
A.ThoughB.UnlessC.Now thatD.Even if
C
考查连词:A.Though 虽然,表示转折,B. Unless除非,表示条件,C. Now that既然,表示原因,    D. Even if即使,表示让步,句意是:既然你许诺来了,你要信守诺言。选C。
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