----What do you think has made Tom feel down?----his seat in the election I think.A. As h

问题补充：

----What do you think has made Tom feel down?

----his seat in the election, I think.

A. As he lost

B. Losing

C. Because of

D. Lost

答案：

A. As he lost

(答案→)B. Losing

C. Because of

D. Lost

解析：考查动名词用法。句意：—你认为是什么让Tom感觉很不好？—我认为是在选举中失去了他的职位。本题中所选的词必须能代替what做句子的主语。ACD三项都不能在句中做主语，只有动名词短语doing sth可以在句中做主语。故B正确。