When he came back three hours later,they were still sitting on the sofa,____ in conversation.A absorbing B absorbed C to absorb

When he came back three hours later,they were still sitting on the sofa,____ in conversation.A absorbing B absorbed C to absorb
When he came back three hours later,they were still sitting on the sofa,____ in conversation.
A absorbing B absorbed C to absorb

When he came back three hours later,they were still sitting on the sofa,____ in conversation.A absorbing B absorbed C to absorb
答案：B
翻译：当他三个小时后回来时,他们仍然坐在沙发上,专注地交谈着.
此题考查非谓语动词做伴随状语的语法.
1.非谓语动词做状语时,需要考查句子主语（即非谓语动词的逻辑主语）和该非谓语动词之间的关系.
2.此题中,they和absorb之间为被动关系,即构成：they be absorbed in conversation.
其中含有一个固定短语be absorbed in...,意思是“全神贯注于...；专心致志于...”.
所以用过去分词absorbed,即答案B为正解.