— When______ you______ the smart hat?
— While my parents were waiting for the plane at the airport.
A. did, buy B.do,buy C.were,buying
A

試題分析：句意:根據(jù)下文,當我的父親正在機場等飛機的時候.可知上文描述的是過去某時發(fā)生的動作,故用一般過去時態(tài),選A.
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)上的對應關系，注意結合這一特點進行區(qū)分。
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