英语首字母填空问题 Dozens of old craftsmen were recruited from two remote factories o_____ Shanghai to work on it.The bridge is expected to have a s____ lifespan of at least 50 years.

问题描述:

英语首字母填空问题
Dozens of old craftsmen were recruited from two remote factories o_____ Shanghai to work on it.
The bridge is expected to have a s____ lifespan of at least 50 years.

of
serving(这个不确定啊)