---_____you _____ out the problem, Sam?
--- Not yet, but I’m going to.
A．Did, workB．Are, workingC．Have, workedD．Will , work
C

試題分析：句意：薩姆，你計算出這道數(shù)學題了嗎？——還沒有，但是快了。結(jié)合語境可知上文描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。選C。
點評：英語中的時態(tài)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(jié)合語境來判斷句子的時態(tài)。英語疑問句中一般具有時態(tài)上的對應關(guān)系，注意結(jié)合這一特點進行區(qū)分。
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