in thought, he sat at the edge of the bed, with his eyeson the letter in his hand.A. Lost;

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A. Lost; fixing
B. Losing; fixed
(答案→)C. Lost; fixed
D. Losing; fixing
解析：句意：他坐在床的边上，眼睛盯着手上的信陷入了沉思。Lost in thought 陷入沉思；fix one’s eyes on 凝视。所以选C。
考点: 考查非谓语的用法。