我记得语法上说分词作状语，其逻辑主语一定要与主句主语保持一致，但我遇到很多不一致的情况，比如：

Facing an $8.3 billion budget deficit this year, closing post offices is one of several proposals the Postal Service has put forth recently to cut costs.

这里facing的逻辑主语明显是Postal Service, 但整句话的主语却是 closing post offices.