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---_____you _____ out the problem, Sam?
--- Not yet, but I’m going to.

A．Did, work

B．Are, working

C．Have, worked

D．Will , work

試題分析：句意：薩姆，你計算出這道數學題了嗎？——還沒有，但是快了。結合語境可知上文描述的是現在已經完成的動作，故用現在完成時態。選C。
點評：英語中的時態主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，如果沒有則要通過分析上下文，結合語境來判斷句子的時態。英語疑問句中一般具有時態上的對應關系，注意結合這一特點進行區分。

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