When I came in I saw her sitting in the sofa in thought.A. to loseB. losingC. lostD. bei

问题补充：

When I came in, I saw her sitting in the sofa in thought.

A. to lose

B. losing

C. lost

D. being lost

答案：

A. to lose

B. losing

(答案→)C. lost

D. being lost

解析：考查非谓语动词。当我进来时，我看到他做在沙发上陷入沉思。Be lost in thought ,陷入沉思，分词做状语故选C项。

考点 非谓语动词。