— are they doing? — They’re .A. What, run B. What, running C. Who, running

发布时间:2020-08-23 08:01:36

—      are they doing? — They’re     . 
A. What, run            B. What, running      C. Who, running

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解析:句意:他们正在做什么?他们正在跑步。what什么,who谁,run跑步,现在分词的形式是双写n加ing,故选B
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