在一篇听力里有一句话:
A 16th century castle in Scotland is close to collapsing after lumps of soil were washed away by floods, threatening its foundations.
请问这里的threatening的逻辑主语是谁? soil和floods好像不太对,还是说是"lumps of soil were washed away by floods"整句话是逻辑主语?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》