When I entered the room I found Mary at the desk her homework.A. sat; doing B. sitting;

问题补充：

When I entered the room, I found Mary at the desk her homework.

A. sat; doing

B. sitting; to do

C. seating; to do

D. seated; doing

答案：

A. sat; doing

B. sitting; to do

C. seating; to do

(答案→)D. seated; doing

解析： 考查非谓语动词。第一个空考查过去分词作宾补， seat动词“坐”没有现在分词形式，故用 seated，第二个空用doing做伴随状语。故选D。句意：当我进入房间的时候，我发现玛丽坐在桌旁，做作业。