Running through the woods，the little boy heard birds ________ first，and then his name ________ from behind by a familiar voice．A.to whistle；calledB.whistling；to be calledC.whistle；callingD.whistling；called
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D解析在see，hear，feel，watch，notice后，分词、不定式作宾语的区别：现在分词表进行；过去分词表被动、完成；不定式表动作全部过程结束了。