Re: [題目] 文法題目請益

先說明我沒有這本書，純粹從你的題目所推導出來的答案。
另外，回覆純粹熱心，畢竟功力不是很強，若有錯誤，
再請海涵與指正。

這句原本句子應該是這樣，
He had considered overseeing the project's progress to be
his top priority until he was transferred to another branch.

但 to be是可以省略的，所以：
He had considered overseeing the project's progress his
top priority until he was transferred to another branch.

藉由被動修改後，變成原題目。
Overseeing the project's progress had been considered his
top priority until he was transferred to another branch.

至於你問到的被動語之後不是不能加受詞his top priority？
其實原因，主要是因為consider是不完全及物動詞，需要在受詞之後，
加名詞或形容詞做受詞補語，而使語意完全。

例如longman字典，以被動語句所寫的範例如下：
Liz Quinn was considered an excellent teacher.

至於剩下時態的文法題，整句語意應該是
監管計畫的進展已經被他視為首要優先考量，直到他被轉到分公司。
副詞子句的直到...，是後發生的事，作者用過去式。
主要句子是直到...發生之前的事，所以比過去更早，可以用過去完成式。

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