1.Entering the office this morning, I found Bob___at the desk, __in thought.

第一个空是答案是seating,第二个空是Lost,我想问第一个空为何不需要seated 呢，或者把found 后面看作是省略that的宾语从句，填was seating,我的这两个答案为何不对呢。


2.The government managed to have two chemical factories built,thought________by the citizen.

答案是opposed to ,为何不选having been opposed to 呢，有空闲先后。


3.The collision of cultures between the two countries led to many nations ______actions against them.

答案是taking ，taking actions 做的什么成分?

1 第一个空应该用seated 或者sitting。seat是及物动词，意为使宾语坐下。所以用seating或者was seating都是不对的。

2 thought应为 though（虽然）。这是让步状语从句省略了 it was. 这种让步状语从句的省略需要是主语和 be 同时省略。

3 lead to为短语动词，= result in，意为致使，引起，后接名词性结构作宾语。many nations taking actions against them 为动名词复合结构作led to的宾语，其中many nations为动名词的逻辑主语（动名词复合结构作介词宾语时，动名词的逻辑主语一般用通格而不是所有格）。