_____ you have worked out the first problem, you may go on to work on the second.
A．Even if B．Unless C．Now thatD．Though
C

試題分析：考查連詞：A. Even if即使B. Unless除非C. Now that既然D. Though雖然，句意：既然你已經(jīng)算出了第一個問題，你可以繼續(xù)算第二個問題。選C。
點評：連詞的詞義辨析要放在上下文的語境中進行，要注意上下文的語義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時間狀語的固定搭配。
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