题目内容

Listen! Do you hear someone __________for help?    
A．callingB．having called C．to callD．called
A
考查非谓语动词作状语.句意,听,你听见有人在喊救命吗?现在分词作状语表示正在发生的动作,完成时态的现在分词表示已经完成的伴随性动作,根据前文可知事情正在发生,故选A.
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