Look ！A boy       on the playground.
A．runsB．runningC．is runingD．is running
D

試題分析：句意;看!一個男孩正在操場上跑步. 結合語境可知本句描述的是正在進行的動作, 故用現(xiàn)在進行時態(tài). run是以重讀閉音節(jié)結尾的單詞, 變現(xiàn)在分詞要雙寫最后一個輔音字母, 故選D.
點評：英語現(xiàn)在進行時表示目前正在進行的動作, 固定結構為be動詞加動詞的現(xiàn)在分詞，考試中可以結合上下文及時間詞，句子結構等信息來進行判斷。對于以重讀閉音節(jié)結尾的單詞，需要注意雙寫最后一個輔音字母在加ing。
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