What          at that time ? ---Playing football.
A．did you doB．do you do
C．were you doingD．a(chǎn)re you doing
C

試題分析：句意：那時你正在做什么？——踢足球。根據(jù)答語及上文時間狀語，可知本句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)。
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