________ we have got everything ready, let’s begin the debate. 
A．Before longB．Rather thanC．Now thatD． Even if
C

試題分析：A. Before long不久以后，B. Rather than而不是，C. Now that 既然，D.  Even if即使，句意：既然我們一切都準(zhǔn)備好了，我們開始辯論吧。選C。
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