PREP5的SC

凑字数

A team of researchers reported that five endangered bird species had resumed nesting or investigated nesting boxes erected by volunteers having been ferried out to the island last month.

• 
  investigated nesting boxes erected by volunteers having been
• 
  begun investigating nesting boxes erected by volunteers, being
• 
  investigating nesting boxes, erected by volunteers,
• 
  were investigating nesting boxes erected by volunteers
• 
  investigate nesting boxes erected by volunteers, which
  

请问一下大家，这题为什么不选C呀，我觉得C和D的平行都不太完美，我理解的C的investigating可以和nesting平行，求个解释谢谢！

长丝弓

以下讨论供你参考：
https://forum.chasedream.com/thread-1370457-1-1.html
https://forum.chasedream.com/thread-1307172-1-1.html
https://forum.chasedream.com/thread-1328548-1-1.html
https://forum.chasedream.com/thread-1337295-1-1.html

凑字数

长丝弓 发表于 2021-8-25 08:22
以下讨论供你参考：
https://forum.chasedream.com/thread-1370457-1-1.html
https://forum.chasedream.com ...

谢谢呀！