--What is Tom doing now ?
--He is _______ on the playground..
A. run        B. runing       C. Running
C

試題分析：句意為：---湯姆正在干什么？---他正在操場跑步。根據(jù)語境可知，是在問一個正在發(fā)生的動作，所以應用現(xiàn)在進行時，其結構是be +動詞ing形式。run的ing形式應雙寫字母n,故應選C。
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