书名：怪物讲师多益阅读
页数：107
题目：
Overseeing the project's progress ＿ his top priority until he was transferred to another branch.
(A) considered
(B) had been considered
(C) have been considered
(D) considering
疑问：为什么B不是A
被动语后不是不能加受词his top priority