After hearing the bad news, Susan found herself of it from time to time while at work.
A. to think
B. thinking
C. though
D. having thought
网友回答
A. to think
(答案→)B. thinking
C. though
D. having thought
解析：考察固定搭配。固定搭配find sb doing sth发现某人不知不觉做某事；句意：在听见这个糟糕的消息以后，Susan发现自己不知不觉地在工作的时候就想起这个消息了。故B正确。