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—I called you at 4:50 yesterday afternoon, but no one answered.
—Sorry. I_______with my friends at that time.
A．swamB．swimC．was swimmingD．will swim
C

試題分析：句意：昨天下文四點五十分我給你大電話了，但是沒有人接�！�，那時我正在和我的朋友游泳。結(jié)合語境可知下文描述的是過去某時正在進行的動作，故用過去進行時態(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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