I found them at a table in thought.A. seated; losingB. seated; lostC. seating ; losingD

问题补充：

I found them at a table, in thought.

A. seated; losing

B. seated; lost

C. seating ; losing

D. seating; lost

答案：

A. seated; losing

(答案→)B. seated; lost

C. seating ; losing

D. seating; lost

解析：考查非谓语动词，第一空考查过去分词作宾补，应用seated，意思是“坐”的时候，没有seating形式，第二空考查过去分词短语作状语，lost in thought，在这里表示伴随，所以选B。