the policeman entered the building,------upsairs

问题描述:

the policeman entered the building,------upsairs
A looking about and hurrying B looked about and hurrying为什么选A

A
这是现在分词短语作状语表伴随行为的
分词作状语时,逻辑主语和句子的主语是一致的,可见是表主动,进行的,故用现在分词‘