一道语法题Madame Curies is believed ________ the radium.A discovering B.having discovered C.to have discovered D.to discover正确答案是C为什么不可以选B?非谓语动词having done 不是也是表示动作在主语谓语动词之前吗?
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![一道语法题Madame Curies is believed ________ the radium.A discovering B.having discovered C.to have discovered D.to discover正确答案是C为什么不可以选B?非谓语动词having done 不是也是表示动作在主语谓语动词之前吗?](/uploads/image/z/7819149-21-9.jpg?t=%E4%B8%80%E9%81%93%E8%AF%AD%E6%B3%95%E9%A2%98Madame+Curies+is+believed+________+the+radium.A+discovering+B.having+discovered+C.to+have+discovered+D.to+discover%E6%AD%A3%E7%A1%AE%E7%AD%94%E6%A1%88%E6%98%AFC%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%8F%AF%E4%BB%A5%E9%80%89B%3F%E9%9D%9E%E8%B0%93%E8%AF%AD%E5%8A%A8%E8%AF%8Dhaving+done+%E4%B8%8D%E6%98%AF%E4%B9%9F%E6%98%AF%E8%A1%A8%E7%A4%BA%E5%8A%A8%E4%BD%9C%E5%9C%A8%E4%B8%BB%E8%AF%AD%E8%B0%93%E8%AF%AD%E5%8A%A8%E8%AF%8D%E4%B9%8B%E5%89%8D%E5%90%97%3F)
一道语法题Madame Curies is believed ________ the radium.A discovering B.having discovered C.to have discovered D.to discover正确答案是C为什么不可以选B?非谓语动词having done 不是也是表示动作在主语谓语动词之前吗?
一道语法题
Madame Curies is believed ________ the radium.A discovering B.having discovered C.to have discovered D.to discover
正确答案是C
为什么不可以选B?非谓语动词having done 不是也是表示动作在主语谓语动词之前吗?
一道语法题Madame Curies is believed ________ the radium.A discovering B.having discovered C.to have discovered D.to discover正确答案是C为什么不可以选B?非谓语动词having done 不是也是表示动作在主语谓语动词之前吗?
当动词believe被用作被动语态时,需要用be believed to do.这个句子的主动形式应该是(we /someone) believe that Madame Curies discovered the radium.改成被动就成了Madame Curies is believed to discover the radium( by us ).
be believed to be 是固定用法
除了楼下的说法,having done 还表示过去一直从事某事直至现在,而且极有可能还在持续当中,居里夫人发现雷元素是很久以前发生的事实,所以。。。。