— 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

解析試題分析：句意:根據(jù)下文,當(dāng)我的父親正在機(jī)場(chǎng)等飛機(jī)的時(shí)候.可知上文描述的是過去某時(shí)發(fā)生的動(dòng)作,故用一般過去時(shí)態(tài),選A.
考點(diǎn)：時(shí)態(tài)
點(diǎn)評(píng)：英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)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(shí)態(tài)。英語疑問句中一般具有時(shí)態(tài)上的對(duì)應(yīng)關(guān)系，注意結(jié)合這一特點(diǎn)進(jìn)行區(qū)分。

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